通配符指的是键盘上（）
A.星号和问号
B.句号和叹号
C.冒号和引号
D.逗号和顿号
参考答案：A
Who did the teacher______ an article for the wall newspaper?[ ]
A. has write
B. has written
C. have write
D. have written
泵内能量损失包括哪几方面？
