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【单选题】
Suppose most people regard emeralds, rubies, and sapphires as close substitutes for diamonds. Then DeBeers, a large diamond company, hasA.
less incentive to advertise than it would otherwise have.
B.
less market power than it would otherwise have.
C.
more control over the price of diamonds than it would otherwise have.
D.
higher profits than it would otherwise have.
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【单选题】A gas at a pressure of 325 torr (mm Hg) exerts a force of __________ N on an area of 5.5 m 2 .
A.
1.8 × 10 3
B.
59
C.
2.4 × 10 5
D.
0.018
E.
2.4
【单选题】These experiments all ______ that a liquid exerts an upward force on any object placed in it.
A.
indicate
B.
suggest
C.
mean
D.
imply
【简答题】普通交流发电机一般由 _____ 、_____ 、_____ 端盖和电刷总成、风扇和带轮等组成
【简答题】A．The car exerts great influence on American culture. B．Public transportation in the U.S. is highly efficient. C．Americans enjoy following a certain schedule. D．What Americans want most is fortune.
【单选题】Which of the following can be the negative impact that trigger warning exerts on literature teaching according to the writer? 查看材料
A.
It may highlight the purpose of literature teaching.
B.
It may expose students to the dark side of the world.
C.
It may deprive students of their intellectual growth.
D.
It may cause students to experience a post-traumatic-stress disorder.
【单选题】A gas at a pressure of 10.0 Pa exerts a force of __________ N on an area of 5.5 m 2 .
A.
55
B.
0.55
C.
5.5
D.
1.8
E.
18
【简答题】普通的交流发电机一般由 、定子、整流器、前后端盖、风扇和带轮等组成。
【单选题】普通汽车交流发电机一般由三相 ( )交流发电机和硅二极管整流器组成 A、 同步 B、 异步 C、 同步或异步 D、 以上答案都不对
A.
同步
B.
异步
C.
同步或异步
D.
以上答案都不对
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