股骨颈骨折行胫骨结节牵引,一般牵引重量为患者体重的()。
A.1/3
B.1/5
C.1/7
D.1/9
E.1/10
参考答案:C
一组数据3,4,x,6,8的平均数是5,则这组数据的中位数是[ ]
A.4
B.5
C.6
D.7
You should understand ______ English is. [ ]
A. what important
B. important what
C. how important
D. important how