塔吊工作前，应检查（）。
A.起升机构是否灵活可靠
B.塔身是否有漏电现象
C.旋转机构是否灵活可靠
D.顶升部分是否漏油
参考答案：B
用所给词的适当形式填空。
1. Could you please ________ (take) these things to my room?
2. Do you mind my ________ (sit) here?
3. I love sunglasses because they are the ________ (cool) things.
4. Can you read ________ (today) newspaper?
5. You can choose one from the ________ (scarf).
土壤微生物
