搜题请搜索小程序“爱下问搜题”
问题
选择题
下列各图中，属于内能转化为机械能的是（ ）
A．
两手相互摩擦能发热
B．
水沸腾时蒸汽冲开壶盖
C．
锯木头锯子发烫
D．
压缩空气引火
答案
答案：
B
补全对话，情景问答
情景交际。
( )1. What's the matter with him?
( )2. How is the weather in Tibet?
( )3. How long are you staying?
( )4. How often does he go fishing?
( )5 When are you leaving?
A. For a week
B. Tomorrow
C. A sore throat
D. Cold
E. Twice a week
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名词解释
官渡之战
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