单项选择题

根据规定，在遇雾、雨、雪、沙尘、冰雹，能见度在50米以内时；在冰雪、泥泞的道路上行驶时；机动车最高行驶速度不得超过多少？

A．30km/h
B．40km/h
C．50km/h
D．60km/h

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听力原文：M: This crazy bus schedule has got me completely frustrateD.I can't for the life of me figure out when my bus to Cleveland leaves.W: Why don't you just go up to the ticket window and ask?What does the woman suggest the man do?A.Try to get a seat next to the window.B.Find another passenger going to ClevelanD.C.Ask for information about the departure timE.D.Find out if there are any seats left on the bus.

A.W:
B.Try
C.
B.Find
D.
C.Ask
E.
D.Find

单项选择题

下图滚动轴承的画法属于（）。 A、通用画法 B、特征画法 C、简化画法 D、规定画法

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