746. Make sure that the sealant does not cause a blockage of the drain

Check the drain for any deterioration of the sealant.

Discard the sealant if it blocks the drain.

Check the sealant does not block the drain.

正确答案：C

设备系统操作理论翻译

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2617. Examine the bottom skin panels of the fuselage for cracks

2616. Make sure that the cable is not caught

2615. The passenger cabin exhaust air goes through floor grilles to the recirculation system or overboard

2614. 校装:飞行舵面的控制和行程的调整,包括钢索张力的设定、飞行舵面行程限制的调整和行程止点的设置

2613. 适当地包括与门控制相关的电气和液压系统。

2612. If you cannot hear the alarm, adjust the volume control

2611. 若为活页,则每一页应注明修订日期和生效日期,或以其他方式标识修订状态

2610. 为乘客和机组成员储存调节和输送氧气的组件和部件,包括氧气瓶释压活门,关断活门,出口,调节器面罩等

2609. 维修信息需要不断更新

2608. If possible, always tell your reader what can occur if the safety instruction is not obeyed