下列指标中用无名数表示的有()。
A、全距
B、平均差
C、标准差
D、标准差系数
E、平均差系数
参考答案:D, E
根据句意和首字母填入所缺单词。
1. You should write everything you have to do next week on the c__________
2. This Sunday I will have a p__________ lesson. I'll learn some new music.
3. Mary can't go on a trip. She has to study for a g__________ test.
4. —Would you like a__________ cup of tea?
—No, thanks. I'm full.
5. I'm busy on w__________ , but I'm free on weekends.
下列不属于理论界关于公司起源形成的观点是()。
A.大陆起源说
B.海上起源说
C.综合说
D.风险说