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【单选题】
How many different roughness requirements are there on the drawing? (Single option: 10 points)A.
Four
B.
Three
C.
Five
D.
None
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反馈参考答案：
举一反三
【单选题】Einstein’s Theory of Relativity was so profound that only a few scientists could understand it.
A.
narrow
B.
superior
C.
wide
D.
deep
【单选题】用显微镜观察细胞时，应选择下列哪种目镜和物镜的组合在视野内所看到的细胞数目最多( )
A.
目镜10×，物镜4×
B.
目镜10×，物镜10×
C.
目镜10×，物镜20×
D.
目镜10×，物镜40×
【单选题】我国花样滑冰老将申雪、赵宏博为了实现夺得金牌的梦想,经过20年的执着追求,终于如愿于偿。这启示我们( )。
A.
任何理想都能实现
B.
理想是不肯能实现的
C.
理想是空想和幻想
D.
要在奋斗中将理想转化为现实
【单选题】A basic postulate of Einstein’s theory of relativity is:
A.
moving clocks run more slowly than when they are at rest
B.
moving rods are shorter than when they are at rest
C.
the laws of physics must be the same for observers moving with uniform velocity relative to each other
D.
light has both wave and particle properties
【单选题】A consequence of Einstein’s theory of relativity is:
A.
moving clocks run faster than when they are at rest
B.
light has both wave and particle properties
C.
everything is relative
D.
moving rods are shorter than when they are at rest
【单选题】What did Einstein’s theory of relativity explain?
A.
The reason why it’s possible to travel backwards and forwards in space.
B.
The reason why it’s possible to travel backwards and forwards in time.
C.
Why is time and space exactly the same thing.
D.
Why doesn’t light travel in a straight line.
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