翡翠是以()为主的集合体,含有少量其它()、()及长石类矿物及一些微量的()矿物。
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稿件在播音语言中不便表露、不能表露或没有完全表露出来的语句关系和语句本质,就是()
Controls for a fixed carbon dioxide system shall be mounted().
A. directly outside the space protected by the system
B. as near the gas cylinders as possible
C. in the pilothouse
D. on the main deck near the bow
水罐消防车的侧出水管路由左右出水管,正回阀、出水球阀和闷盖等主要部件组成。
A. 正确
B. 错误