题目内容

Questions 23 to 25 are based on the conversation you have just heard.

A. She had her vacation there.
B. She took a diving course there.
C. She was there on a field trip.
D. She visited a marine exhibition.

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沉淀称量法中的称量式必须具有确定的化学组成。( )

A. 对
B. 错

在进行沉淀时，沉淀剂不是越多越好，因为过多的沉淀剂可能会引起同离子效应，反而使沉淀的溶解度增加。( )

A. 对
B. 错

有一棵非空二叉树，其第K层上最多有______个结点。

有以下程序： #include＜stdio.h＞ #include ＜stdlib.h> int fun(int n) int p; P=(int,) malloc(sizeof(int)); -p=n; return p; main() int a; a=fun(10); printf("%d\n", a+fun(10)); 程序的运行结果是( )。

A. 0
B. 10
C. 20
D. 出错