超前支护小导管一般搭接多长？
参考答案：
根据暗挖施工进尺，小导管搭接长度一般不小于进尺加连接筋搭接长度。
面对水土流失我们应该：
A．无动于衷
B．过度放牧
C．乱砍滥伐
D．植树造林
The mountain climbers had to return , as their food and water are________.
[ ]
A. run out of
B. run out
C. given out
D. using up
