EI32-JD型计算机联锁系统的联锁机柜采用欧洲标准结构,机柜内包括:()
A.联锁机箱
B.驱采机箱
C.驱动机箱
D.采集机箱
参考答案:A, B, C, D
正常妇女骨盆倾斜度为()
A.30°
B.50°
C.60°
D.70°
E.90°
The children _____ on the playground when I left school.
A.were playing
B.are playing
C. was playing