大多数测站电池在电池电压小于（）V时，不宜再过度放电，否则会_爱下问搜题

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问题单项选择题

大多数测站电池在电池电压小于（）V时，不宜再过度放电，否则会对电池造成损害。

A.10

B.11

C.12

D.13

答案

参考答案：B

完形填空

I moved to Chicago ten years ago. As I was new to the area, I had     friends and seldom went out to parties. But a month later, I was invited to a party and there I     an elderly couple.
The wife and I     for a long time. She told me how     she was about her husband who was     a heart operation. At that time I was working as a researcher in the same     where the husband would be going for his operation,     I told her to take down my phone number and     me to let me know when he was there.
She phoned a few weeks later as     and told me that her husband was admitted to the hospital and     waiting. I told her that I would go and check on him every day while I was at    . I thought that if it was my dad, I would do the same, so I decided to give them some    .
Weeks turned into months and it just became my     to see them and keep track of how things were going before, during and after the heart operation. Sometimes I'd bring a     for him to read, or some food that we would share    . As time went by, it seemed like I became part of the    . Even after the husband returned from the hospital, we still often     each other on holidays.
Now, ten years later, I     my own family. Since our parents don’t     close by, this couple has become my son’s “local” grandparents. My wife and I often feel truly     to have this couple as our “local” parents! Sometimes family comes out of the most unexpected place.

B．waiting for

D．turning down

多项选择题

在简易覆盖栽培中，无纺布覆盖的特点有（）。

A.保温

B.保湿

C.透光

D.透气

E.吸湿