如何手动打开上脚踏的进行维护作业?
参考答案:
1、关闭上脚踏的供风塞门;
2、把上脚踏向前上方拉出至固定位;
3、拉出到位后插入安全插销防止脚踏意外收回。
教学评价
DBMS will "manage "the stored data items and assemble the needed items from the (74) database in response to the queries of those who aren't programmers.
A.extention
B.the same
C.common
D.particular