輪機(jī)英語單項(xiàng)選擇題每日一練(2019.08.09)

來源：考試資料網(wǎng)

1 The function of lubricating oil is to （）.

2 With four-stroke engines, it takes four revolutions of the crank shaft to make （） power stroke(s).

3 As the amount of moisture in the air increases, the difference between the dry bulb and wet bulb temperature will （）.

4 The term （） refers to one complete sequence of operations required to produce power in an engine.

5 The resistance of electric wire will decrease as its （）