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问题
单项选择题
铝粉着火时主要用____扑救。
A.水
B.泡沫灭火器
C.砂土
答案
参考答案：C
补全对话，情景问答
为问题选择合适的回答。
( ) 1. Where is my black pen?
( ) 2. How many books do you have?
( ) 3. What's his name?
( ) 4. Where is the school?
( ) 5. How are you?
A. His name is Li Lin.
B. There it is.
C. Fine, thanks.
D. Look. It's on your desk.
E. Five.
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单项选择题
2t/h是下列反映锅炉工作特性基本参数中（）的参数值。
A、蒸发量
B、供热量
C、压力
D、温度
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