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【单选题】
An astronaut has left the International Space Station to test a new space scooter. Her partner measures the following velocity changes, taking place in a 10s interval. At the beginning she is moving toward the right at 15.0 m/s, and at the end she is moving toward the left at 15.0 m/s. The magnitude of her average acceleration is________m/s^2.A.
3
B.
8
C.
12
D.
7
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】灭头虱的方法中,下列哪项是错的
A.
用纱布蘸百部酊、按顺序擦遍头发
B.
反复揉搓头发10min
C.
24h后用篦子篦去死虱,洗头
D.
梳子和篦子去清洗后消毒
E.
梳下的头发包在纸袋焚烧处理
【简答题】这一部分用一个词概括居里夫人高尚的人格美。
【单选题】It is strange that so many of the important meetings in people's lives take place quite by chance, I could have sat【C1】______in the train I caught to London【C2】______the day I left university【C3】_____...
A.
nowhere
B.
everywhere
C.
anywhere
D.
wherever
【简答题】简述铁水预脱硫处理的有利因素。
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