题型:选择题 强酸溶液A与强碱溶液B,在常温下其pH之和为15,当它们按一定体积比混合时,溶液的pH恰好为7,则A与B的体积比为[ ]A.1 : 1 B.2 : 1 C.1 : 10 D.10 : 1 查看答案
题型:选择题 —When did the old man die? —In 2007. He ______ for nearly three years.A. died B. has died C. has been dead 查看答案
题型:单项选择题 fseek函数的正确调用形式是A) fseek(文件指针,起始点,位移量) B) fseek(文件指针,位移量,起始点)C) fseek(位移量,起始点,文件指针) D) fseek(起始点,位移量,文件指针) 查看答案