问答题

‏做板框压滤机的过滤实验时，滤液的流动路线与洗水的流动路线是。‎

答案：不同的，相反的

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单项选择题

What is inferred about mouthwash in the article?
A、It makes your teeth stronger.
B、It kills bacteria in the mouth.
C、It stops you from eating too much sugar.
D、You can use it instead of brushing.

求向量x的算术平均值的指令是[填空1]

答案：第1空:mean(x)