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【单选题】
0-1背包问题的回溯算法所需的计算时间为( )A.
O（n2n）
B.
O（nlogn）
C.
O（2n）
D.
O（n）
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反馈参考答案：
举一反三
【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
【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
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