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【单选题】
带传动中,v1 为主动轮的圆周速度, v2 为从动轮的圆周速度,v 为带速, 这些速度之间存在的关系是 。A.
v1 = v2 = v
B.
v1 > v > v2
C.
v1 < v < v2
D.
v1 = v > v2
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举一反三
【单选题】What’s mean of “Approach” signal aspects ?
A.
tell the train to proceed
B.
tell engineers to move at restricted speed.
C.
tell engineers stop immediately .
D.
tell engineers to reduce its speed to 35miles per hour and prepare to stop at the next signal.
【简答题】门窗都有 的作用。
【单选题】What’s mean of “restricting” signal aspects ?
A.
indicates that the train may proceed at restricted speed.
B.
indicates that the train may proceed.
C.
indicates that the train stop immediately .
D.
indicates that the train should reduce its speed to 35miles per hour and prepare to stop at the next signal.
【简答题】听力。 1. What’s the probable relationship between the speakers? A. Doctor and patient. B. Operator and caller. C. Customer and repairman. 2. How many cities has the man traveled to according to the conv...
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