系统中员工培训主要分为哪几类（）。
A.岗前培训
B.资质培训
C.业务轮训
D.其他
参考答案：A, B, C, D
计算现浇混凝土楼梯工程量时，下列做法正确的是( )。
A．以斜面积计算
B．扣除宽度小于500mm的楼梯井
C．伸入墙内部分不另增加
D．整体楼梯不包括连接梁
(74) systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and (75) on the disk, and controlling peripheral devices such as disk drives and printers.
A．Operation
B．Operator
C．Operating
D．Operate
