（1）实验室若要配制220mL，1mol/L的稀硫酸应选用的容量瓶规格是：______；当定容时，视线偏低，则配得的溶液溶质物质的量浓度______1mol/L（填“＞”“=”、“＜”）

（2）下列有关实验操作的说法正确的是______

A．可用25mL碱式滴定管量取20.00mLKMnO₄溶液

B．用PH试纸测定溶液的PH时，需先用蒸馏水润湿试纸

C．蒸馏时蒸馏烧瓶中液体的体积不能超过容积的

D．将金属钠在研钵中研成粉末，使钠与水反应的实验更安全

E．用NaOH溶液洗涤并灼烧铂丝后，再进行焰色反应．

试题一 阅读下列说明，回答问题。 【说明】 逻辑覆盖法是设计白盒测试用例的主要方法之一，通过对程序逻辑结构的遍历实现程序的覆盖。针对以下由C语言编写的程序，按要求回答问题。 int XOR(char * filename, unsigned long key){ FILE * input = NULL , *output = NULL; //i char * outfilename = NULL; int len = strlen(filename); unsigned char buffer; if( (filename[len-2] == ’.’) && (filename[len-1] == ’c’) ) { //2,3 outfilename = new char[len+1]; //4 strcpy(outfilename, filename); outfilename[len-2] = ’\0’; } else{ //5 outfilename = new char[len+5]; strcpy(outfilename, filename); strncat(outfilename,".c",2); } input = fopen(filename,"rb"); if( input == NULL) { //6 cout ＜＜ "Error opening file " ＜＜ filename ＜＜ endl; //7 delete [] outfilename; outfilename = NULL; return 1; } output = fopen(outfilename,"wb"); if( output == NULL ) { //8 cout ＜＜ "Error creating output file " ＜＜ outfilename ＜＜ endl; //9 delete [] outfilename; outfilename = NULL; return 1; } while( ! feof(input) ) { //10 if( fread(&buffer,sizeof(unsigned char),1,input) != 1 ) { //11 if( ! feof(input) ) { //12 delete [] outfilename; //13 outfilename = NULL; fclose(input); fclose(output); return 1; } } else{ //14 buffer ^= key; fwrite(&buffer, sizeof(unsigned char),1,output); } } fclose(input); //15 fclose(output); delete [] outfilename; return 0; }

请给出问题2中控制流图的线性无关路径。