20.0克物质,以毫克表示时,应为()。
A、20000mg
B、200×102mg
C、20.0×103mg
D、2.00×104mg
参考答案:D
The experts suggested the problem worth paying attention ____ at the meeting. [ ]
A. to be discussed
B. to been discussed
C. being discussed
D. should be discussed
地震灾情上报内容包括哪四个方面?