在拖带过程中,应时刻注意溺者的()不可没在水下。
参考答案:口、鼻
法半夏的常用剂量是()
A.3~9g
B.1.5~4.5g
C.0.03~0.06g
D.9~45g
E.0.5~2g
There _______ a pen and some pencils on the desk. [ ]
A. are
B. is
C. have
D. has