坝垛险情的抢护原则是什么?
参考答案:护土固根。确保重点,兼顾一般。
Where have you been all these days? We are very _____ about your safety. [ ]
A. interested
B. frightened
C. surprised
D. concerned
下列给药途径中,元首关消除的有______
A.舌下给药
B.直肠给药
C.喷雾给药
D.口服给药
E.静脉给药