My family _____________ six members. [ ]
A. has
B. had
C. have
答案：A
4.7﹣3.6+(﹣0.5)
静脉注射时选择的血管是（）
A.较粗直
B.易滑动
C.弹性好
D.避开关节
E.由远心端到近心端选择血管
