网络谈判中应注意的问题有（）。 A.加强法律意识 B.注意网络谈判的局限性 C.注意

Do you find that when you are busy with your study on the Internet, the speed of your computer slows down   小题1:  sometimes? It is probably because your computer gets infected by virus (病毒), which can make it more difficult for you to use the computer. How to keep viruses小题2: your computer is a problem now. But in fact, nothing can ensure (保证) the security of your computer one hundred percent. There are, somehow some things you can do to  小题3: your computer’s security system and decrease (降低) the possibility of an infection.

You can   小题4: your system up to date with the current anti-virus software (反病毒软件), and use the following methods

氧苄胺嘧啶抑制细菌的：（）。

A.蛋白质合成

B.RNA.合成

C.叶酸代谢

D.D.NA.合成

国家还没有出台任何一部与网络经济相关的法律法规。

提高闸室抗滑稳定的措施有（）。

A.增加闸室底板的齿墙深度

B.利用上游钢筋混凝土铺盖作为阻滑板

C.将闸门位置略向下游一侧移动，或将水闸底板向上游一侧加长，以便多利用一部分水重

D.增加铺盖长度，或在不影响抗渗稳定的前提下，将排水设施向水闸底板靠近，以减小作用在底板上的渗透压力

什么是大接地电流系统？什么是小接地电流系统？