《科技英语写作 Scientific English Writing》课程教学资源（PPT课件讲稿）（双语版）Section Ⅳ

Scientific English Writing Section Iv

Scientific English Writing Section Ⅳ

Ex 2 IL. 19. This rule can be used for all integers, both positive and negative 27. Impedance in an ac circuit plays the same role that resistance does in a dc circuit 28. Two parallel wires a distance of o apart carry the current i。 Ex3 IL. 7. This facilitates their use in circuit analysis

Ex. 2 II. 19. This rule can be used for all integers, both positive and negative. 27. Impedance in an ac circuit plays the same role that resistance does in a dc circuit. 28. Two parallel wires a distance of δ apart carry the current i. Ex.3 II. 7. This facilitates their use in circuit analysis

10. Here we must use wires one thousandth the diameter of a silk thread. 14. AC can be changed into DC, a process called rectification 16. An instrument for measuring current, voltage and resistance, the multi-meter is widely used in the work having connection with electricity. 19. This curve shows the fall in conductivity with increasing temperature

10. Here we must use wires one thousandth the diameter of a silk thread. 14. AC can be changed into DC, a process called rectification. 16. An instrument for measuring current, voltage and resistance, the multi-meter is widely used in the work having connection with electricity. 19. This curve shows the fall in conductivity with increasing temperature

T. 1. The second law of motion provides a method for measuring shat is called the"inertial mass"of a body. All one needs to do is to apply the same force in turn to a standard of mass and to an un known mass and then to compare their accelerations, something that can be done anywhere in the universe with the same results No matter where we are, we can always tell a wooden ball from a lead ball of the same size by throwing them

IV. 1. The second law of motion provides a method for measuring shat is called the “inertial mass” of a body. All one needs to do is to apply the same force in turn to a standard of mass and to an unknown mass and then to compare their accelerations, something that can be done anywhere in the universe with the same results. No matter where we are, we can always tell a wooden ball from a lead ball of the same size by throwing them

2. **: male, born in 1938, professor, and advisor for doctoral students. He graduated from the Xi'an Military Telecommunications Engineering Institute in 1964 and remained there as a faculty member. He has long been engaged in the teaching and research in the field of radar. Through close cooperation with quite a few radar research institutes and enterprises. he has successively undertaken or taken charge of more than twenty national defence key preliminary research projects and engineering projects with many practical achievements, most of which have been popularized and applied, or used to equip the armed forces, thus ma king contributions to the development of radar technology in China

2. **: male, born in 1938, professor, and advisor for doctoral students. He graduated from the Xi’an Military Telecommunications Engineering Institute in 1964 and remained there as a faculty member. He has long been engaged in the teaching and research in the field of radar. Through close cooperation with quite a few radar research institutes and enterprises, he has successively undertaken or taken charge of more than twenty national defence key preliminary research projects and engineering projects with many practical achievements, most of which have been popularized and applied, or used to equip the armed forces, thus making contributions to the development of radar technology in China

Independent work 3 1、人体是由大大小小无数结构构成的。( using an adjective phrase to express the underlined part) 2、这台计算机的速度由于它使用了继电器而受到了限 制。( using a prepositional phrase to express the underlined part) 3、他们使用了与卡车同宽的一些厚木板。( using a noun phrase to express the underlined part The human body is made up of numerous structures large and small This computer was limited in speed by its use of relays They used plants the width of the truck

Independent work 3 1、人体是由大大小小无数结构构成的。(using an adjective phrase to express the underlined part) 2、这台计算机的速度由于它使用了继电器而受到了限 制。（using a prepositional phrase to express the underlined part） 3、他们使用了与卡车同宽的一些厚木板。（using a noun phrase to express the underlined part ） The human body is made up of numerous structures large and small. This computer was limited in speed by its use of relays. They used plants the width of the truck

4.如果这关系式成立的话,我们就会得到一个负 的电流,这种情况是不可能的。 5.色谱法( chromatography)是一种非常有效的 分离方法,它已得到了广泛的应用。 6.一块15m长的厚木板放在相距8m的两个支座上。 If this relation were to hold, we would get a negative current, an impossible situation A very effective separation method s chromatography is widely used a plant 15-meter-long is put on 2 supports 8 meters apart

4. 如果这关系式成立的话，我们就会得到一个负 的电流，这种情况是不可能的。 5. 色谱法（chromatography）是一种非常有效的 分离方法，它已得到了广泛的应用。 6. 一块15m长的厚木板放在相距8m的两个支座上。 If this relation were to hold, we would get a negative current, an impossible situation. A very effective separation method, chromatography is widely used. A plant 15-meter-long is put on 2 supports 8 meters apart

SECTIONⅡ Parenthesis, negation, and comparison I. Parenthetic clauses (1) in the main clause Nuclear fission it has been claimed will be a cheap, clean and almost inexhaustible source of power. Potential energy, it is true, might not affect the sense of touch in the same way as kinetic energy would (2)in the sub-clause Ohm's law has a few forms which it will be found are very useful

SECTION Ⅱ Parenthesis, negation, and comparison I. Parenthetic clauses (1) in the main clause Nuclear fission, it has been claimed, will be a cheap, clean and almost inexhaustible source of power. Potential energy, it is true, might not affect the sense of touch in the same way as kinetic energy would. (2) in the sub-clause Ohm’s law has a few forms which it will be found are very useful

One of the major problems which faced me in writing this book was 'digesting the vast literature on computer-aided library systems and presenting it in what I hope is a clear and concise manner ( 3)say=let us say Well-grounded students can absorb Chapters 4 and 5 in say three weeks A resistor of say 100 ohms may be connected across the capacitor

One of the major problems which faced me in writing this book was ‘digesting' the vast literature on computer-aided library systems and presenting it in what I hope is a clear and concise manner. (3) say=let us say Well-grounded students can absorb Chapters 4 and 5 in say three weeks. A resistor of say 100 ohms may be connected across the capacitor

II. Negation This parameter does not change during all time intervals Eq (5)cannot be satisfied for all values of x. 普通的窗户均承受不了如此大的力。 None of the ordinary windows can withstand so large a force 这些学生对那些电路均不熟悉

II. Negation This parameter does not change during all time intervals. Eq.(5) cannot be satisfied for all values of x. 普通的窗户均承受不了如此大的力。 None of the ordinary windows can withstand so large a force. 这些学生对那些电路均不熟悉