单项选择题
A.a compressed packing gland B.lantern tings between the packing rings C.a liquid seal D.the stuffing box gland
Tube leaks in the distillate cooler of a two stage flas...
单项选择题Tube leaks in the distillate cooler of a two stage flash evaporator will result in （）.
A.loss of second stage vacuum B.contamination of the distillate C.lower feed inlet temperature D.contamination of the second stage condenser
The pressure of a liquid leaving the pump can be referr...
单项选择题The pressure of a liquid leaving the pump can be referred to as the （）.
A.total head B.discharge head C.net positive suction head D.suction head
The delivery rate of a variable stroke axial piston hyd...
单项选择题The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the （）.
A.slide block B.tilting box C.pintle D.reaction ring
