地基土中孔隙水压力越大,土的抗剪强度越高
参考答案:错
—Did you know any French before you arrived in Washington?
—Never ____ it, actually.
A.had I learned
B.have I learned
C.I learned
D.was I learning
我国的信息安全网络体系坚持()方针。
A、积极防御、综合防范
B、政府监管
C、放任自理
D、主动防御