两组导轨在水平面内的垂直度误差，可用方框水平仪检查。
参考答案：错
Windows 7 was created in 2009, ___ many computer lovers were interested and excited. [ ]
A. where
B. why
C. which
D. when
设立经纪类证券公司其注册资本最低限额为( )万元人民币。
A．3000
B．4000
C．5000
D．6000
