單項(xiàng)選擇題Main steam and exhaust pipes for winches and similar gear shall not pass through crew accommodation nor, whenever technically possible, through alleyways leading to crew accommodation; where they do pass through such alleyways, they shall be adequately （）.

A.ventilated and tagged
B.ventilated and cooled down
C.insulated and encased
D.insulated and warmed up


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題When a refrigeration compressor is in the ‘off’ cycle, the thermal expansion valve will（）.

A.always be wide open when the compressor restarts
B.continue to operate as if the system were in operation
C.remain open until evaporator pressure equalizes, then close until the compressor restarts
D.always be completely closed until the compressor restarts