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问题
单项选择题
在下面几个图中，表示开口式双肢箍筋的是（）。
A．
B．
C．
D．
答案
参考答案：
D
选择题
He was so pleased with all _____ we had done for him _____ he wrote us a letter to praise us for it.
A. what; what
B. what; that
C. that; what
D. that; that
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单项选择题
木门窗安装时要埋好防腐木砖，木砖中心距不大于（）mm
A.1000
B.1200
C.1500
D.2000
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