三级国产国语三级在线蔓延,秘密通道入口自动进入3秒系统

1 （） is not installed on the main switchboar.

2 Before liquid can flow into a pump, the air in the suction line must be （） sufficiently to cause the liquid to flow into the suction chamber.

3 The use of sinking and dispersing agents for the removal of surface oil is （）.

4 In the refrigeration system, a shortage of refrigerant is indicated by （）.

5 Voltage generated by most AC generators is fed from the machine to the bus by means of（）.

6 Emulsion oils and sodium nitrite are both approved additives, but the latter cannot be used if any pipes are （） or if any soldered joints exit.

7 In the two stroke diesel engine, it is designed so that the oil impingement is timed to proceed only on the piston ring belt during（）

8 The fire drill must, as far as practicable, be conducted if （）.

9 When a ship is entering to narrow waterway and the fuel feeding of the main engine is keeping unchanged, which of the following is the wrong conclusion?（）

10 The four basic components of a fire are fuel, heat, oxygen and a chain reactionWhich of the following statements best describes what must be eliminated to extinguish a fire?（）

輪機(jī)英語章節(jié)練習(xí)(2020.03.19)