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A solenoid valve used in a refrigeration system should be installed （）.
A:with the axis of the solenoid horizontal, sensing temperature of the box, and upstream of the thermal expansion valve
B:upright, sensing temperature of the box, and upstream of the thermal expansion valve
C:upright, sensing temperature of the box, and downstream of the thermal expansion valve
D:upright, sensing heat of the tail coil, and upstream of the thermal expansion valve

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出自：海船船员证

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