测速表附件线速度圆盘周长为()mm。
A、314
B、250
C、377
D、440
参考答案:A
Lily is a good student. She ________late for school. [ ]
A. is hardly ever
B. isn’t never
C. is often
D. is always
巴纳德认为专业化是复合性正式组织的特征之一,专业化的首要方面是( )
A.计划 B.协调 C.指导 D.目标