皮皮学，免费搜题
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【单选题】
受热面无论是积灰、结渣或积垢，使炉膛出口烟温（）A.
不变
B.
突然降低
C.
增高
D.
降低
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】lt's so cold outside. Put on more clothes. They can _____ the cold. [ ]
A.
keep on
B.
keep out
C.
keep up
D.
keep away
【单选题】W hich of the following is mentioned in your textbook as a guideline for effective informative speaking?
A.
Avoid talking about your personal experiences.
B.
U se chronological organization whenever possible.
C.
R elate to the audience by speaking in technical terms.
D.
Don’t overestimate what the audience knows.
【简答题】When the mixture is used, it is important to _________ [ A] keep sugar and salt in water [ B ] drink it as often as necessary [ C] take it as much as possible [ D]use it to kill the bacteria
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