搜题请搜索小程序“爱下问搜题”
问题 单项选择题

船舶需进行明火作业时，其危险区域的开敞甲板，从作业点向首尾延伸，以船舶宽度为界，向下至平台或甲板，向上（）米的柱形空间为作业环境考查区域.

A.2

B.3

C.4

答案

参考答案：A

填空题

词汇运用。

1. Amy has vegetables every day. But now she _________ (eat) a hamburger.

2. If you want to _________ (health), have the food on these _________ (shelf).

3. We all would like to make friends with the boy _________ (call) Tom.

4. The _________ (two) lesson is not difficult to understand.

5. My friend doesn't like carrots. So he never has _________. (some)

6. There are _________ (little) than two kilos of salt in the kitchen.

7. It's important _________ (have) a right diet and lifestyle.

8. I will tell you the size of my _________ (foot), then you can buy a pair of shoes for me.

9. The city is really modern, but it also has a lot of air _________ (pollution).

查看答案
单项选择题

交-交变频装置输出频率受限制，最高频率不超过电网频率的（），所以通常只适用于低速大功率拖动系统。

A、3/4

B、1/5

C、1/2

D、2/3
查看答案