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v满足向量线性运算的全部8条运算规律则

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向量组的基就是。

感染性微生物的危险度等级分为几类？

A. 4
B. 5
C. 6
D. 7

I级生物安全柜100%气流外排，II级生物安全柜30%气流外排，70%气流进入内循环。

A. 对
B. 错

Modern technology has a big influence on our daily life. New devices are widely used today. For example, we have to (1)_the Internet every day. It is becoming more and more (2) to our nearly everybody. Now it is time to think about how the Internet influences us. What _(3)_it has on our social behavior.The internet has totally _(4) our life, there is no doubt about that I think that the Internet has changed our life in a __(5)way.