问题
单项选择题
自动磨边机更换砂轮的步骤是：（1）首先拔下电源；（2）用大扳手来锁定砂轮；（3）（）；（4）小心去掉砂轮；（5）按与上相反步骤装回砂轮。
A、用大扳手去掉螺母
B、用手去掉螺母
C、用钳子去掉螺母
D、用内六角扳手去掉螺母
答案
参考答案：D
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自动磨边机更换砂轮的步骤是：（1）首先拔下电源；（2）用大扳手来锁定砂轮；（3）（）；（4）小心去掉砂轮；（5）按与上相反步骤装回砂轮。
A、用大扳手去掉螺母
B、用手去掉螺母
C、用钳子去掉螺母
D、用内六角扳手去掉螺母
参考答案：D
| 选词填空，完成短文。 | |
Shenzhen on May 2nd. On the first day, I went to a park ____________ my father and my mother. On the second day, I ____________ swimming. On the third day, I ____________ my homework. For the day of the ____________ holiday, we relaxed and prepared to work or school. |