排烟风机应保证在280℃时能连续工作( )分钟。
A.70
B.50
C.30
D.10
参考答案:C
用所给单词的适当形式填空。
1. We have many sports ______ (club).
2. Let's ______ (have) some bananas.
3. He likes ______ (broccoli).
4. My mother______ (not like) apples.
5. ______ Joy ______ (play) basketball?
6. He ______ (play) sports every day.
7. These are______ (she) bananas.
8. ______ they ______ (like) oranges?
企业经营业绩评价及其指标体系发生变化的重要原因是()的变化:
A、组织结构
B、经营环境
C、市场环境
D、客户心理