防盗安全门有（）等基本结构形式，前两种是主导产品。A、全封闭

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问题多项选择题

防盗安全门有（）等基本结构形式，前两种是主导产品。

A、全封闭平开式、内开或外开门

B、平开栅栏式内开或外开门

C、卷帘式拉闸门

D、折叠式栅栏门

答案

参考答案：A, B, D

补全对话，情景问答

1.	— What's the weather like? — It's w___________ and s___________.
2.	— What's the weather like? — It's h___________ and s___________.
3.	— What's the weather like? — It's c___________ and w___________.
4.	— What's the weather like? — It's c___________ and s___________.

选择题

已知：CO₂+CaCO₃+H₂O＝Ca(HCO₃)₂，Ca(HCO₃)₂能溶于水．向澄清石灰水中通入过量的CO₂，下列图示能正确表示该过程中各个量之间关系的是