单项选择题

21.点式玻璃幕墙驳接爪在安装时由于施工方便，可以不安装橡胶垫圈。（　）
A、正确
B、错误

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单项选择题

We should not ________ ourselves to the classroom. We should go out of the classroom, see the world and talk to others as much as we can. A.
entertain B.
confine C.
assign D.
involve