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单项选择题

5、polo轿车盘式制动器的制动片厚度检测用的工具一般是（    ）。
A、千分尺
B、游标卡尺
C、百分表
D、以上答案都不对

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判断题
High levels of effort don’t necessarily lead to favorable job performance unless the effort is channeled in a direction that benefits the organization.
正确
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单项选择题
根据“柠檬市场”理论，二手自行车市场上销售的大都是盗窃来的自行车，会加剧自行车盗窃的发生。
A．对
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单项选择题
Light from a helium-neon laser (l = 633 nm) passes through a hole with a diameter D. The diameter of the central maximum in the diffraction pattern on the viewing screen behind the hole is d. If the diameter D of the hole is increased, then how change is the central maximum diameter d of the diffraction pattern on the viewing screen?
A、Increasing.
B、Decreasing. 
C、Unchanging. 
D、None of above.
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