721型分光光度计的空白档可以采用()空白,蒸馏水空白或其它有色溶液或中性吸光玻璃作陪衬。
参考答案:空气
阅读理解。
Here's the content (目录) of a book.
1. If you're interested in music, you can read "_______".
A. National sports
B. Sad movies
C. The planets
D. Weather service
2. You can leam something about weather in _______.
A. Unit l
B. Unit 2
C. Unit 3
D. Unit 4
3. Words about _______ are in Unit 5.
A. music stars
B. weather conditions
C. sports tools
D. space news
4. In all the units, you can leam the skill of _______.
A. predicting by title
B. understanding attitude
C. understanding main ideas
D. guessing meaning of new words
企业管理员岗:可实现账户查询、()、客户服务等。
A.存款管理
B.转账汇款
C.代付业务
D.自助缴费