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为什么要保持乳化液箱和曲轴器上的透气孔的畅通？

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Priming of the tides occurs（）.

A. at times of new and full Moon
B. when the Earth，Moon，and Sun are lying approximately on the same line
C. when the Moon is between first quarter and full and between third quarter and new
D. when the Moon is between new and first quarter and between full and third quarter

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为什么要保持乳化液箱和曲轴器上的透气孔的畅通？

Priming of the tides occurs（）.

简述嫉妒心理特点及其危害性。

（）是由于地层陷落引起的地震。

二氧化碳加压系统主要包括哪些设备？