444、机身是半硬壳结构。

A. 　 Use the specified one if the equivalent material is not available.

B. 　 Use the available equivalent one if no material is specified.

C. 　 lf you can not get the specified material, use an equivalent.

A. 　 CRES causes magnesium, aluminum, or cadmium to corrode when it touches these metals.

B. 　 Stainless steel corrodes once touching magnesium, aluminum or chromium metals.

C. 　 Magnesium, aluminum, or chromium metals shall be protected from the corrosion caused by CRES.

A. 　 If the filters become clogged, send them to the laboratory for analysis of the contamination.

B. 　 lf the filters are surged, send them to laboratory for contamination analysis

C. 　 lf the contaminant is blocking the filter the material should be sent to the laboratory for analysis’s

A. 　不论怎样的“危机”大多数总是会出现需要马上快速反应的故障,比如全动力故障,着火或烟雾,或者客舱的
快速释压。

B. 　可是一个“危急情况”几乎总伴随着故障,需要立即快速反馈,比如一个动力装置故障, 着火或烟雾,或快
速客舱减压。

C. 　然而,紧急情况”几乎总是涉及需要立即和快速响应的故障,如整个动力装置失效,火灾或烟雾,或座舱快
速失压。

A. 　当火警启动时,温度增加并引起灭火器工作。

B. 　当火焰开如时,温度增加并造成触发器工作,

C. 　当起火时,温度升高并使探测器工作。

A. 　请勿将工具和碎片置于发动机附近。

B. 　 把除工具外的其它物品(例如碎片)从发动机附近清除

C. 　把工具和发动机上的碎片移除。

A. 　 For release with the ground preconditioned air connection single valve inoperative in the open position, do these steps.

B. 　 For dispatch with the ground preconditioned air connection check valve inoperative in the open position, do these steps.

C. 　 For release with the ground recondition ed air connection check valve inoperative in the open position ,do these steps.

A. 　 Hoist the outflow valve toggle switch in the OPEN position until the outflow valve position indicator shows

B. 　 Hoist the outflow valve trigger switch in the OPEN position until the outflow valve position indicator shows

C. 　 Hold the outflow valve toggle switch in the OPEN position until the outflow valve position indicator shows

A. 　为避免不必要的磨损,将表面涂漆。

B. 　为避免不必要的颗粒,将表面清洁。

C. 　为避免不必要的摩擦,将表面抛光。

A. 　 A surge tank drain single valve is on the outside fuel tank end rib in main tank 1 and main tank 2.

B. 　 A surge tank drain one way value is on the inboard fuel tank end rib in main tank 1and main tank 2.

C. 　 A surge tank drain check valve is on the outboard fuel tank end rib in main tank 1and main tank 2