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交换批准书的概念是什么?

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板块边界类型有离散、()、平错三种。

传统礼仪要求人们的举止()。

A. 站如松
B. 坐如钟
C. 行如风
D. 卧如弓

The size of the exhaust valve opening is ()

A. most critical in a four-stroke cycle diesel engine
B. most critical in a two-stroke/cycle diesel engine
C. most critical in a four-stroke/cycle diesel engine if it is turbocharged
D. of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine

生产经营场所使用的垃圾桶要求()

A. 加盖密封
B. 可不密封
C. 视具体情况而定

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