离心式水泵的几何安装高度应限制在（）范围。
A.4-5m
B.5-6m
C.5-7m
D.6-7m
参考答案：B
硝酸甘油在胃酸中水解失效，可以制成()。
A．泡腾片
B．软胶囊
C．舌下片
D．缓释片
E．糖衣片
It was very kind of her. She insisted _______ her car to us.
A．to lend
B．lending
C．on lending
D．in lending
