第3题: [单项选择]通过哪种方式可以减少金属镉向农作物的转移( )。 A. 加入石灰使pH值增加,使其转化成难溶盐 B. 加入Ca(COI)CI使pH值增加,转化成难溶盐 C. 加入硅酸使pH值降低,转化成难溶盐 D. 加入CaCI2使pH值降低,转化成难溶盐 E. 加入NaCI与镉元素结合 参考答案:A
第15题: [单项选择]What is John doing now [A] He is speaking to others. [B] He is having a meeting. [C] He is doing his work. 参考答案:B 答案解析:[听力原文] W: Hello, may I speak to John M: He is having a meeting now. Would you please leave a
第24题: [单项选择]设存在函数int max(int,int)返回两参数中较大值,若求22,59,70三者中最大值,下列表达式不正确的是()。 A. int m = max(22,max(59,70)); B. int m = max(max(22,59),70); C. int m = max(22,59,70); D. int m = max(59,max(22,70)); 参考答案:C