通常用普鲁卡因作为局部浸润麻醉是因其
A.毒性小,作用时间长
B.毒性小,作用起效快
C.毒性小,麻醉效果强
D.穿透力强
E.以上都不对
参考答案:C
氮肥损失的途径主要包括氨的()、硝态氮淋失和反硝化脱氮。
— Look! What is that nice building used for?
— It ______ as a hotel, but I'm not sure. [ ]
A. must be used
B. can't be used
C. may be used
D. should use