[单选] The static suction lift of a pump is the difference in elevation between the （）.

A . centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump
B . centerline of the pump and the suction liquid level when the source of liquid is above the pump
C . centerline of the pump and the level of the discharge liquid
D . liquid levels of the suction and discharge

如果网络入侵者是在防火墙内部，则防火墙是无能为力的。下列不属于社会剖析派作家的是（）吴组缃。穆时英。沙汀。艾芜。试述光纤材料色散的定义及其引起的原因。一切法律、行政法规和地方性法规都不得同（）相抵触。规章。宪法。党章。党的政策。油井基本资料有射开层位、（）、上下油层与邻井的连通情况、储量、层系划分、井下技术状况等。各层的厚度。各层的厚度、孔隙度。渗透率、孔隙度。各层的厚度、渗透率。 The static suction lift of a pump is the difference in elevation between the （）.

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[单选] The static suction lift of a pump is the difference in elevation between the （）.

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