38. Some managers believe they can strengthen their team by__________.
A) making friends with all their employees
B) attending a management training course
C) providing a free Friday lunch to the staff
D) encouraging their staff to exercise regularly
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39. The word “backfire” in the last paragraph most probably means “_____________”。
A) strengthen the relationship
B) start a fire in the backyard
C)produce an undesired result
D) improve management skills
40. The passage is mainly about the importance of______________
A) management training courses for employers
B) proper relationship between managers and staff
C) setting business goals for both managers and staff
D) being a part of social networking for a good manager
关于继电器的主要功能，说法错误的是（ ）
A. 以小电流控制大电流；
B. 遇大电流时熔断以保护电路；
C. 减少手动开关的数量；
D. 保护较小的开关以及较细的导线。
起动机中共有（ ）个电刷，其中（ ）个位绝缘电刷。
A. 4,2
B. 2,4
C. 2,1
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