支承座孔和主轴前后颈的（）误差，使轴承内外圆滚道相对倾斜。
A、平行度
B、位置度
C、圆跳动
D、同轴度
参考答案：D
—What do you think of summer in Nanjing?
—Well, it’s sometimes ______ hot and sometimes there is ______ rain.
A．too much, much too
B．too much, too much
C．much too, much too
D．much too, too much
查看用户群STR工作状态的指令是（）。
A.EXEGP
B.EXEPP
C.STSTP
D.EXEDP
