163、安装座垫之前先安装座椅。

　Install the seat after you install the cushion.

　Install the cushion before you install the seat.

　Install the seat before you install the cushion.

正确答案：C

解析：

解析:注释: after 之后; before 之前。seat 座椅;cushion 座垫。

60、Make sure that the wire is in the position to cause the parts to lock.

59、技术动词必须遵守与 STE 中其他被批准的动词相同的规则。

58、查阅飞机记录本的故障记录以及中央 DU 或 CDU 上的相关故障信息,听取机组反映的故障,报告故障并处理。

57、如果污染物造成孔堵塞超过 30%,就要清洁显示组件后面的孔。

56、The surge tank drain check valve also prevents fuel flow from main tank 1 and main tank 2 to the surge tank.

55、Use the manual control in an emergency.

54、If possible, supply sufficient examples from your technical documentation to support your proposal.

53、Set the applicable L PACK switch or the R PACK switch, on the P5-10air conditioning panel, to the AUTO position.

52、The ventilation system uses differential pressure to pull air out of the airplane.

51、Put a transparent sheet of plastic on the surface.