某地基土的天然重度γ=18.6kN/m3,内摩擦角,黏聚力,当采取坡度1∶1开挖坑基时,其最大开挖深度可为多少?
参考答案:
(2012·天津)—Can I have a day off tomorrow,Mr.Johnson?
—________.I can manage without you.
A.Forget it
B.I'm afraid not
C.It depends
D.Of course
试述晶体管逆变器的工作原理。