聚合物的相对分子量具有()
A、多分散性
B、单分散性
C、单一性
D、具有统计性
参考答案:A
— My brother will go to America for further education this summer.
— _________ Actually, we have many good universities here at home. [ ]
A. Why bother?
B. So what?
C. Forget it!
D. What if?
在拍卖图录制作前,要将全部拍品目录或实物送交()作行政鉴定。