【简答题】请输入37号计算机本环节操作的反馈代码。
【简答题】请输入37号计算机本环节操作的反馈代码。
【单选题】If the head pressure is too high, .
A.
the relief valve should open before the high-pressure cutout
B.
the relief valve should open and let excess refrigerant go to receiver
C.
the high-pressure cutout switch should operate before the relief valve opens
D.
close in on the suction valve
【单选题】小孙是某中学初三学生,最近常常无缘无故地破坏公物,从人类行对社会的作用和后果看,这属于一种()行为。
【简答题】请输入37号计算机本环节操作的反馈代码。
【简答题】请输入37号计算机本环节操作的反馈代码。
【简答题】请输入37号计算机本环节操作的反馈代码。
【单选题】If the head pressure of a reciprocating refrigeration compressor is excessive
A.
the relief valve should open before the high pressure cutout
B.
the relief valve should open and allow the excess refrigerant to flow to the receiver
C.
the high pressure cutout switch should operate before the relief valve opens
D.
you should close the discharging valve
【单选题】What is the purpose of the pressure relief valve?
A.
- To relieve hydraulic pressure to the return manifold
B.
- To relieve excessive air pressure to the atmosphere
C.
- To provide overpressure warning to the ECAM
【单选题】双杆作业时,位于舱口上方的舷内吊杆俗称( )