单项选择题

Personnel working with refrigeration systems, and subject to the exposure of refrigerants should wear （）.

A.face shield
B.a respirator
C.rubber gloves
D.an all purpose gas mask

相关考题

To absorb the wear resulting from impeller rotation and...

单项选择题To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with （）.

A.lantern rings
B.bearings
C.easing volutes
D.wearing rings

If the capacity of a centrifugal pump decreases gradual...

单项选择题If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the （）.

A.packing gland
B.mechanical seals
C.lantern rings
D.wearing rings

Distilled water from an evaporator may be discharged in...

单项选择题Distilled water from an evaporator may be discharged into a potable water tank （）.

A.through a detachable hose connection
B.after passing through an activated charcoal filter
C.after chemical analysis shows it is fit for consumption
D.through a solenoid operated three-way valve

船舶辅助机械

Personnel working with refrigeration systems, and subject to the exposure of refrigerants should wear （）.