单项选择题

Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by （）.

A.a compressed packing gland
B.lantern tings between the packing rings
C.a liquid seal
D.the stuffing box gland

点击查看答案&解析

上一题目录下一题

单项选择题

A.loss of second stage vacuum
B.contamination of the distillate
C.lower feed inlet temperature
D.contamination of the second stage condenser

单项选择题

A.total head
B.discharge head
C.net positive suction head
D.suction head

单项选择题

A.slide block
B.tilting box
C.pintle
D.reaction ring