当进液量()外输液量,缓冲罐液位下降到下限时,传感器将信号传递给变频柜,变频柜自动停泵,停止输液。
A.小于
B.等于
C.大于
D.为零
参考答案:A
阅读小天地:读一读,选一选。
Summer holiday is coming. My sister wants to go to Shanghai, because it is very near from my city. My
father wants to go to Sanya. He says, " It is very beautiful and warm." My mother wants to stay at home. She
wants to have a rest (休息). But I am going to Beijing. Because it is not far. At last (最后) our family decides
(决定) to go to Beijing. I am very happy.
1. Where does the family to go at last?
A. Beijing.
B. Sanya.
C. Shanghai.
2. How many people are there in the family?
A. Two.
B. Three.
C. Four.
3. Who wants to stay at home?
A. Sister.
B. Mother.
C. Father.
4. My father wants to go ____________ for the holiday.
A. Shanghai
B. Sanya
C. Beijing
5. Is Beijing very far from my home?
A. Yes, it is.
B. No, it isn't.
C. We don't know.
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