地下开采时厚度()以下的煤层为薄煤层。
A、0.5m
B、0.8m
C、1.3m
D、3.5m
参考答案:C
You'll need to ________ them that you are able to do the job well.[ ]
A.calm
B.convince
C.concern
D.disagree
各个路由协议衡量路由的好坏标准是()。
A、路由
B、路由器优先级
C、路有权
D、包转发率