题目内容

EDTA与金属离子形成的酸式络合物或碱性络合物的稳定性较差。

A. 对
B. 错

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IDS是一类重要的安全技术，其实现安全的基本思想是 (48) ，与其他网络安全技术相比，IDS的最大特点是 (49) 。

A. 过滤特定来源的数据包
B. 过滤发往特定对象的数据包
C. 利用网闸等隔离措施
D. 通过网络行为判断是否安全

在液-液萃取分离法中，分配比随溶液酸度改变。

A. 对
B. 错

下列程序中划线处正确的语句是( )。#include ＜iostream＞using namespace std;class Basepublic:void fun() cout＜＜"Base:: fun"＜＜end1; ;class Derived: public Base void fun() _______________________ //显试调用基类的函数 fun() cout ＜＜"Derived:: fun"＜＜end1;;

A. fun();
Base. fun();
C. Base:: fun();
D. Base-＞fun();

The sun shines because it is made of glowing gases. It gives off its own light. The moon shines too, but it doesn’t give off any light of its own. We can see the moon only because it reflects light from the sun. The moon travels around the earth about every twenty-nine days. During this time, the moon looks as if it changes size and shape. It seems to grow from a small part of a shining circle into a full circle. Then it becomes small again. The moon doesn’t really change. It is just because we see different parts of it lit up by the sun. The moon seems to change size and shape because ______.

A. it gives off different amounts of light
B. part of it bums up
C. we see different parts of it