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问题 单项选择题

用于溶血反应和补体结合试验的稀释缓冲液，除了含有适量的氯化钠和具有一定的pH外，还需含有少量（）

A.钾离子

B.钙离子和镁离子

C.铜离子

D.铁离子

E.钠离子

答案

参考答案：B

单项选择题

Most computer systems are (26) to two different groups of attacks: Insider attacks and outsider attacks. A system that is known to be (27) to an outsider attack by preventing (28) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (29) users. Detecting such abusive usage as well as attacks by outsides not only provides information on damage assessment, but also helps to prevent future attacks. These attacks are usually (30) by tools referred to as Intrusion Detection Systems.

A．power

B．rights

C．authorized

D．common
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判断题

上海证券交易所和深圳证券交易所对权证的上市资格标准不尽相同。（）
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