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【单选题】
The vibration pump provides the hydraulic drive for vibration motor on the lefthand of the drum, which generates the vibration by _______ the eccentric shaft.
A.
rotating
B.
reciprocating
C.
rotated
D.
reciprocated
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举一反三
【单选题】Reduced capacity accompanied by vibration and noise at the suction of a centrifugal pump is a result of ____.
A.
cavitation
B.
Water hammer
C.
Fluid friction
D.
Steam knock
【单选题】Reduced capacity accompanied by vibration and noise at the suction of a centrifuga pump results from the Action of vapor pockets in the water being pumped caused by__
A.
fluid friction
B.
pump knocking
C.
cavitation
D.
water hammer
【单选题】以下不是需求分析阶段的基本任务的是()
A.
调查分析用户活动
B.
收集和分析需求数据，确定系统边界
C.
编写数据库系统总结报告
D.
协助用户明确对新系统的各种需求
相关题目：
【单选题】Reduced capacity accompanied by vibration and noise at the suction of a centrifugal pump is a result of ____.
A.
cavitation
B.
Water hammer
C.
Fluid friction
D.
Steam knock
【单选题】Reduced capacity accompanied by vibration and noise at the suction of a centrifuga pump results from the Action of vapor pockets in the water being pumped caused by__
A.
fluid friction
B.
pump knocking
C.
cavitation
D.
water hammer
【单选题】以下不是需求分析阶段的基本任务的是()
A.
调查分析用户活动
B.
收集和分析需求数据，确定系统边界
C.
编写数据库系统总结报告
D.
协助用户明确对新系统的各种需求
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