菱镁石有哪些颜色?
多媒体技术处理的媒体元素主要包括文本、图像和()等信息。 ["时间日期","数值","动画","声音","视频影像"]
下列各种筹资活动中,()活动会加大财务杠杆作用。 ["增加银行借款","增发公司债券","增发优先股","增发普通股"]
A feeler or thermal bulb is used for the expansion valve to (). ["detect the temperature","detect the pressure","heat the refrigerant","accelerate the refrigerant"]
试写出矿物亲水性大小排序。
矿粉中有哪些有害杂质(3种以上)?