Generally, Americans will not wait long, ten minutes (at most).
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When Ameracans plan an event, they usually set the time days, a week or even a month (in advance).
A. 对
B. 错
The passage is written for people who are (new to) American behavior around appointments and punctuality.
A. 对
B. 错
柔性体约束的约束反力,其作用线沿柔索的中心线( )。
A.其指向在标示时可以先任意假设
B.其指向在标示时有的情况可任意假设
C.其指向必定是背离被约束物体
D.其指向也可能是指向被约束物体
约束是通过约束反力阻得物体运动的。这一说法( )。
A. 正确
B. 错误