为什么井下禁止带电搬运电气设备？

A. only when the cargo is within its rail
B. during the time when loading or ynloading is going on
C. after the cargo is checked by tallymen
D. as soon as loading or discharging begi

A. 期限
B. 结算账户需保留的基本存款额度
C. 基本存款额度部分的存款利率
D. 起存金额

A. 我国农业生产比较落后
B. 我国经济比较落后
C. 我国农产品市场供需关系发生了变化
D. 我国经济体制发生了变化