静脉滴注氯化钾注射液的适宜浓度是()
A.0.1%~0.2%
B.0.1%~0.3%
C.0.2%~0.4%
D.0.2%~0.5%
E.0.3%~0.5%
参考答案:C
在空间直角坐标系中,A(2,3,4),B(3,1,2)两点之间的距离为______.
You'd better smoking, or you will get ill. [ ]
A. go on
B. give up
C. give away
D. keep on