钢筋混凝土圈梁的宽度与墙同厚，高度一般不小于（）
A.120mm
B.180mm
C.200mm
D.240mm
参考答案：A
用所给词的适当形式填空。
1. I think the light bulb is the most useful _____ (invent).
2. Thomas Edison was a great _____ (invent).
3. The cup is used for _____ (warm) the cold wine.
4. The length of the rope is _____ (adjust).
上尿路结石最常见的类型是
A．氨基酸结石
B．草酸钙结石
C．磷酸镁铵结石
D．尿酸结石
E．碳酸钙结石
