问题
单项选择题
测定污水滤膜系数取样前要先打开取样阀门,以5~6/min的流速畅流()。
A.3min
B.4min
C.5min
D.6min
答案
参考答案:A
测定污水滤膜系数取样前要先打开取样阀门,以5~6/min的流速畅流()。
A.3min
B.4min
C.5min
D.6min
参考答案:A
On September 19 this year, you will see a full moon (满月). It is the Mid-Autumn Festival (中秋节).The festival is on the 15th day of the eighth lunar (农历) month. And it is one of the most important festivals in China. It is a big time for families and friends to get together. In the evening, people sit around a table and look at the bright moon. They eat sweet or salty moon cakes (月饼). People can see a lot of lanterns (灯笼) in the street. Children like guessing (猜) the answers to the lantern riddles (灯谜). The Mid-Autumn Festival is also a harvest (收获) festival. Farmers begin to harvest fruits and vegetables.
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