扫查浅表组织时,探头频率最高可使用多少兆赫()。
A.20MHz
B.10MHz
C.7.5MHz
D.5.0MHz
E.3.5MHz
参考答案:A
There is _____ work for me to do. I am really tired. [ ]
A. too many
B. too much
C. many too
D. much too
评价矿业工程土体的地基承载力、边坡稳定性的重要指标是土的()。
A.密实度
B.类别
C.抗压强度
D.抗剪强度