问题
单项选择题
沉降分离脱水就是利用水重油轻的性质,通过特定的装置进行沉降,使()而将油、水分开。
A、原油下沉
B、水上浮
C、水下沉
D、原油上浮
答案
参考答案:C
沉降分离脱水就是利用水重油轻的性质,通过特定的装置进行沉降,使()而将油、水分开。
A、原油下沉
B、水上浮
C、水下沉
D、原油上浮
参考答案:C
完形填空。 We have a two-day holiday __1 _ week. We don't have any lessons __2__ Saturday or Sunday. So every weekend I have a good __3__. On weekend, I like __4_ a trip. I sometimes go to the country with my classmates __5__ bus to breathe (呼吸) the fresh air., watch the green hills and blue water, and __6 _ in the beauty of the country. sometimes I go for a picnic in the open _7__ with my friends by bike, we sing and dance __8 __ there. Sometimes I go to __9__ a place of interest with my parents by car. My weekend is always _ 10__ interesting and happy. | ||||
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