组织论文段落,主要应当依循哪些要求?
站用电的主要负荷有?() ["控制保护系统的交直流电源","冷却系统电源","照明、采暖、空调、消防等","加热电源"]
用凯氏定氮法测定食品中的蛋白质,为了提高溶液的沸点而加快有机物的分解,可以加入() ["A.辛醇","B.硫酸钾","C.硫酸铜","D.硼酸"]
测定糖液浓度应选用() ["A.波美计","B.糖锤度计","C.酒精计","D.酸度计"]
按照规定,移动通信基站联合接地装臵的接地电阻值应不大于()。 ["5欧","3欧","2欧","1欧"]
秘书处理与新闻媒介关系的方法有哪些?