螨虫的鄂体又称假头,位于躯体的前端或前部腹面,由()组成 ["A、膝肢、鳌肢、须肢及鄂基","B、口下片、鳌肢、须肢及颚基","C、口下片、鳌肢、须肢及颚体","D、口下片、鳌肢、膝肢及鄂基"]
客户申请开立哪些银行结算账户需经人民银行核准?
路径损耗步长因子在()左右通常可以产生接近最大的上行系统容量而不会对可达到的小区边缘数据速率产生明显损耗 ["0.7-0.8,","0.6-0.7,","0.5-0.6,","0.8-0.9."]
连铸二冷区是()水。 ["一次冷却水","二次冷却水","三次冷却水","四次冷却水"]
轴流式压气机单级叶轮对每千克空气做的轮缘功,其大小与:()有关. ["空气流量","扭速、圆周速度","燃气流量","空气的总温总压"]
计算题:粗苯岗位4月份产轻苯1560吨,月耗干煤147169吨,求当月收率为多少?