下载APP
举一反三
【单选题】The Exploding Lakes of Cameroon What comes to mind when youthink of a lake? You probably imagine a pretty scene with bue water, brds, and fish. FOr the people in the northwestern Cameroon, however,the...
A.
Water will flow down the hills.
B.
Poisonous gases will bereleased suddenly.
C.
A strong wind will rise from the lakes.
D.
The volcanoes will come to life.
【单选题】对于不稳定的松散岩质路堑地段，应遵循的施工原则有（）。
A.
自上而下，分级开挖
B.
自下而上，掏底开挖
C.
自上而下，分层加固
D.
自上而下，分级排水
E.
自下而上，分级排水