脑室引流的目的()
A.保持引流通畅
B.防止逆行感染
C.便于观察引流液的颜色
D.观察引流液的性质
E.观察引流液的量
参考答案:A, B, C, D, E
Leave your key with a neighbor _______ you lock yourself out one day.
A.ever since
B.even if
C.soon after
D.in case
内外筒在
轴间的连梁应有 ( )道。
A.4
B.5
C.6
D.7