在我国香港特别行政区，证券投资基金一般被称为（）。

When the heat load begins to increase, the needle valve of an expansion valve will______.

A.move in an opening direction

B.move in a closing direction

C.either open or close

D.not move at all

When the refrigeration demand is small,_______.

A.the expansion valve will move toward the wide open position

B.the expansion valve will move toward the closing position

C.the feeler bulb will conveys the high temperature

D.the superheat degree will raise

A.later and closing earlier

B.later and closing later

C.earlier and closing earlier

D.earlier and closing later

A substantial increase in crankcase pressure could be an indication of ______.

A.excessive lube oil pressure

B.the proper seating of new rings

C.a worn cylinder liner

D.a malfunctioning cylinder relief valve

A.the starting air distributor

B.the cut-off valve on the air main

C.the main starting valve

D.the air bottle control valve

A.burner valve

B.root valve

C.quick closing valve

D.oil return valve

A、Accurate opening pressure of the valve (lower than the inlet pressure > 1kPa when the oil and gas recovery device is regenerated)

B、Select a proper one-way valve to minimize the opening pressure and flow resistance of the valve

C、Oil and gas recovery pipe diameter shall not be less than DN80

D、Resistance of oil and gas recovery pipe coupling valve (improved structure)

The crude oil overflowed from measuring-hole due to ______ the valve of No.1 tank．

A.not close

B.not closing

C.not have closed

D.no closing

A.add refrigerant to the system

B.adjust the thermal expansion valve to the proper setting

C.adjust the float valve to the proper holding pressure

D.open the hand expansion valve

A(n) _____ is a special type of valve which prevents the passage of steam but allows condensate to pass.

A.check valve

B.non-return valve

C.steam trap

D.quick closing trap