The amount of fluid delivered by a reciprocating pump can be regulated by （）.
A. throttling the pressure line
B. changing the speed of the piston
C. either A or B
D. None of the above is tree
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电焊机开关箱及电源线路接线和线路故障排除必须由（）进行。
A. 任何人
B. 专业电焊工
C. 专业电工
Which two EIGRP options will limit a query domain？（）
A. configuring EIGRP stubs
B. configuring a second EIGRP AS and redistributing
C. configuring summary addresses
D. configuring an offset-list
E. configuring a prefix-list
F. configuring unicast neighbor
“白日鼠”白胜没有参加智取生辰纲。
A. 正确
B. 错误
发现空调管路内壁脏污，应及时用高压水枪冲洗干净，并立即装车使用。
A. 正确
B. 错误
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