题目内容
如图所示结构受一力偶矩为M的力偶作用，铰支座A的反力RA的大小是 ()。
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下列各项,不属于收入的是()。
A、B两国都是WTO成员国，A国制定了对汽车尾气排放进行限制的技术法规，要求所有汽车必须安装催化转换器。在B国，同样的目的是通过使用柴油发动机实现。A国向B国出口的汽车，只要符合A国的相应技术法规即可，不必按B国相应法规对汽车进行调整，反之亦然。这体现了贸易技术壁垒(TBT)协议的基本原则中的()原则。
已知一物块重P=100N，用F=500N的力压在一铅直表面上，如图所示，其摩擦系数fs=0.3，此时物块所受的摩擦力为()。
W: Well. Allen, the mountain-lake cycle tour is a two-day bicycle tour from Ottawa to Kingston and back. It is not a race, but more like an endurance test for recreational cyclists. People do it for fitness and fun and try to better their time every year. M: How long does it take to cycle one-way, Marilyn？
W: About seven to nine hours for the average cyclist. Racers can do it in four hours. But as I said, the tour is not intended to be a race.
M: How many people will be taking part this year？
W: This is our biggest year ever. We have twelve hundred cyclists registered.
M: I'd hate to be on the road when the cyclists start out.
W: Don't worry, we've introduced staggered starts to avoid these problems. Our first group will leave Ottawa at seven o'clock, and other groups will follow every twenty minutes.
M: Thank you, Marilyn. Now down to the starting line of the university.
Where did this interview take place？
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