1133. Some chemicals must be well kept so that they can be used

Some chemicals can not be used if they are well kept.

Some chemicals must be well kept as long as they can ben used.

Some chemicals can be used only if they are well kept.

正确答案：C

设备系统操作理论翻译

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2230. When you push the FAULT/INOP test witch, faults are simulated to do a check of the circuit ability to detect a fault

2229. 此专用工具用于拔出衬套。

2228. It is necessary to clean the filter periodically

2227. Replenish spare bulbs container as required

2226. 系统中控制螺旋桨桨距的部分。包括调速器,同步器,电门,钢索,杆等。不包括随螺旋桨组件旋转的任何零件。

2225. 提供从飞机的一部分到另一部分以及飞机与其他飞机或地面站之间的通信方式的组件和部件,包括语音和C-W通信部件、PA系统、对讲机和磁带录音机。本章可以参考飞机随附的供应商数据,以代替以下第-00至-70节,如适用。

2224. If one or more blades are missing make an entry in the engine logbook

2223. 除了按照段落714的要求而出现零部件制造商的报头的页面,制造商的报头、模板和出版标题应出现在每一页的顶部

2222. Operate the unit for two cycles to remove air from the lines

2221. The door is made of carbon fiber reinforced plastic