题目内容

滚子链是标准件，其标记由（）、（）、（）和（）四部分组成。

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套筒滚子链常用的接头形式有（）、（）和（）等。

解释滚子链牌号：滚子链08A-2-90 GB/T1243-2006

41. As we all know, independence is very __ for youngsters because sooner or later they will leave their families and live alone.A. essentialB. accurateC. flexibleD. temporary42. When dealing with students, teachers are supposed to adopt _ and caring appro aches, as they are unique young individuals of different personalities.A. abstractB. efficientC. flexibleD. effective43. When the post fell , Dennis Bass was appointed to fill it.A. emptyB. blankC. vacantD. bare44. He's one of those people with a very _ imagination -- every time he hears a noise he's convinced it's someone breaking in.A. adequateB. relevantC. abundantD. vivid45. After four years' research, we now have a ______ better understanding of the disease.A. veryB. farC. fairlyD. quite

（）是配送合理化的基本思想。

A. 均衡
B. 供应保证
C. 经济效益
D. 服务