中耕工作部作外边缘与作物之间应保持一定距离的()。
参考答案:护苗线
用动词的正确形式填空。
1、I (meet) my old friend a moment ago.
2、There ( be ) some beautiful flowers and some water in the vase just now.
3、A : What you (do) last Friday ? B: I (go) to a concert.
4、A : you ( take ) part in the last singing contest. B: No, I .
5、Yesterday the girl (show) me a nice skirt. I (like) it very much.
6、I (make) a card for my cousin last Christmas.
7、A : they ( do ) their homework yesterday evening? B: Yes, they .
8、How many trees (be) there in the garden last month?
9、I (pick) apples on the farm last October.
10、I (be) ten years old last year. I (blow) ten candles on the cake.
当轴的转速低于()r/min,应用润滑脂将整个轴承室充100%。
A.2/3
B.1/2
C.60
D.1/3