爱迪思认为以下哪些属于创业期的正常现象?()
A.过早授权
B.唱“独角戏”,但愿意听取不同意见
C.过早制定规章制度和工作程序
D.创业者丧失控制权
参考答案:B
-----Tom. You look very bored and tired.
-----Yes, I ______ my father on the farm until seven o’clock this morning.
A.have been helping
B.had helped
C.was helping
D.am helping
低速抖振和高速抖振的速度范围()
A、随重量增加而减小,与压力高度无关
B、只在低高度处受到影响
C、随高度增加而缩小