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【简答题】
如图所示,已知F1=10kN,F2=10kN,G=30kN,F1、F2与x轴夹角中的锐角均等于45°,求F1、F2、G三个力组成的平面汇交力的合力。
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【单选题】In terms of pressure and temperature in the refrigerant in the compressor, what happens to the primary? .
A.
its pressure and temperature are both lowered
B.
its pressure and temperature are both raised
C.
its pressure is lowered and its temperature is raised
D.
its pressure is raised and its temperature is lowered
【单选题】In terms of pressure and temperature refrigerant in the compressor, what happens to the primary?
A.
Its pressure and temperature are both lowered
B.
Its pressure and temperature are both raised
C.
Its pressure is lowered and its temperature is raised
D.
Its pressure is raised and its temperature is lowered
【单选题】Which of the following terms is used to identify the pressure of the liquid entering a pump?
A.
Suction head
B.
Pump head
C.
Discharge head
D.
Total head
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