GIS巡检项目有外观检查、（）检查、操动机构状态检查。
参考答案：气体密度值
165. The headmaster ______ a new teacher ______ the students just now.
A．was introduced; to
B．was introducing; to
C．introduced; to
D．introduced; for
596×188-596×24-596×64的值是( )。
A．58600
B．59600
C．59500
D．58500
