基站覆盖范围与以下哪些个因素无关（）
A.天线高度
B.天线类型
C.基站发射功率
D.用户
参考答案：D
Though Jack is often tired ______ his job, he is never tired ______ it. In fact, he enjoys it. [ ]
A. of; with
B. with; from
C. from; of
D. at; with
只有符合一定条件的可保风险才可以运用保险来进行管理。( )
