我国水资源分布特点是[ ]
A．东部多，西部少
B．夏秋季节多，冬春季节少
C．春季最多，冬季最少
D．北部多，南部少
AB
My colleague has been recovering gradually since the operation, and it wont’ be long ______ he comes back to work．
A．before
B．since
C．after
D．when
井深在3500m以内18m井架后后二道地锚的开挡是12～14m。
