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[单选] The oil mist detectors continuously() the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity measuring track.

A . detract
B . extract
C . pump up
D . pump dow

In the Northern Hemisphere,winds veering sharply to the west or northwest with increasing speed are indications that a(). cold front has passed。 low pressure center is approaching。 stationary front exists。 high pressure center has passed。 暂态感应电流对人体是否有影响? 功能测试通常也被称为() 黑盒测试。 白盒测试。 单元测试。 边缘值测试。 关于外资企业的经营期说法正确的有() 由外国投资者申报,由审查批准机关批准。 期满需要延长的,应当在期满一百八十天以前向审查批准机关提出申请。 期满需要延长的,应当在期满一百二十天以前向审查批准机关提出申请。 审查批准机关应当在接到申请之日起三十天内决定批准或者不批准。 电场影响的标准如何? The oil mist detectors continuously() the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity measuring track.
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