下列命题中，是假命题的是[ ] A．△ABC中，若∠C= ∠A

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问题选择题

下列命题中，是假命题的是[ ]

A．△ABC中，若∠C= ∠A－∠B，则△ABC为直角三角形

B．△ABC中．若∠A：∠B：∠C=5：2：3，则△ABC为直角三角形

C．△ABC中，若a：b: c=2；2：3，则△ABC为直角三角形

D．△ABC中，若a=c，b=c，则△ABC为直角三角形

答案

答案：C

补全对话，情景问答

阅读下面对话，根据对话内容补全对话中所缺少的单词，每空一词。

A: Hello. Who's that?

B: This is Jim speaking.

A: Hello, Jim. I'm having a party this Saturday. Would you like to (1)________?

B: Sure. I'd love to. Where's your (2)________ house, Linda?

A: 45 Water Street. It's near a park. I (3)________ here last month.

B: Would you like me to come (4)________? I can (5)________ get things (6)________.

A: That would be nice. Could you come at about four?

B: OK. (7)________ be there?

A: Oh, some friends. You know them. Would you like to bring (8)________?

B: I would like you to meet my brother. Do you (9)________ if I (10)________ him?

A: No. The more, the better.

B: Thank you. Bye-bye!

A: Bye.

单项选择题

压力容器的( )是指在相应温度下用以确定容器壁厚的压力。

A．最高工作压力

B．最大允许压力

C．设计压力

D．操作压力