一般而言,要求作为货币的商品具有如下特征()
A、价值比较高
B、金属的一种
C、易于分割
D、易于保存
E、便于携带
参考答案:A, C, D, E
Over two thirds of the population were believed to have no ______ to the health care in the west rural area in China.
A.aid
B.basis
C.belief
D.access
简述光缆线路巡查日常维护的周期各为多长时间?