我
- A.present
- B.prevent
- C.avoid
- D.provide
- A.current in the circuit
- B.voltage in the circuit
- C.inductance in the circuit
- D.resistance in the circuit
- A.oil spray
- B.oil bath
- C.oil control rings
- D.drilled passage through the camshaft
- A.the camshaft
- B.the flange
- C.the ridge
- D.the bulge
- A.higher than the actual drum water level
- B.equal to the actual drum water level
- C.increasing due to steam condensation in the glass
- D.lower than actual drum water level
- 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
- A.The high discharge pressure of the rotary pumps permits a larger volume of fluid per unit time than the reciprocating pump
- B.Rotary pumps are capable of pumping more fluid than reciprocating pumps of the same weight
- C.Rotary pumps occupy only one-half the space of reciprocating pumps
- D.Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pump
- A.machine efficiency
- B.machinery efficiency
- C.mechanical efficiency
- D.mechanics efficiency
- A.The piston rod
- B.The cross head pin
- C.The gudgeon pin
- D.The crank-pin
- A.a centrifugal fan
- B.a direct expansion cooler
- C.a hermetic compressor
- D.a centrifugal pump
