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【单选题】
锅炉（）时必须停炉熄火。A.
受热管少量渗漏
B.
安全阀咬死不能开
C.
一只水位计损坏
D.
发生汽水共腾
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【简答题】鱼翅是用( )的鳍干制而成。
【单选题】These are the facts ______ by the school.
A.
to gather
B.
gathering
C.
gathered
D.
being gathered
【简答题】are the facts obtained from yzing information that is expressed in numbers.
【简答题】These are the facts my argument is based. (on)
【单选题】The following choices are the facts about the manner about opening and closing the door at home and office in Germany, which one is right?
A.
The widely-open door shows accepting and welcoming friends and strangers
B.
The narrowly-open door shows one knocking at the door before enter
C.
The half-opened door shows welcoming some people while others not
D.
The closed door shows the attitude of privacy protection.
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