有效和无效的登录尝试事件包含在（）。
A.应用程序日志
B.安全日志
C.系统日志
D.安全日志和系统日志中都包含
参考答案：B
I can’t quite remember ________ you started playing golf.
A．when it was that
B．when was it that
C．that it was when
D．that was it when
砂的粗细程度用细度模数(Mx)表示，粗砂的Mx值范围为( )。
A．3.7～3.1 B．3.0～2.3C．2.2～1.6 D．1.5～1.0
