皮皮学，免费搜题
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【多选题】
系统是指采用洒水喷头的自动喷水灭火系统，以下自动喷水灭火系统中属于系统的有（）。A.
湿式系统
B.
干式系统
C.
预作用系统
D.
重复启闭预作用系统
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
【单选题】You can do what you are told when receiving a promotional mailing telling you a travel prize is waiting for you to get.
A.
Y
B.
N
C.
NG
【单选题】When receiving treatment, patients are always
A.
active by challenging the doctors' decision.
B.
passive without questioning anything.
C.
satisfied with the treatment.
D.
disobedient to the doctors' persuasion.
【单选题】____ the cylinder walls, the heat passes through them by conduction.
A.
When receiving by
B.
When received by
C.
In order to receiving
D.
In order to receive
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