影响滑轮组机械效率大小的主要因素是: [ ] A、重物移动距离的大小 B、

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问题:

影响滑轮组机械效率大小的主要因素是: [ ]

A、重物移动距离的大小      

B、动力作用点移动距离的大小

C、动滑轮的总重与摩擦力的大小  

D、定滑轮的个数与摩擦力的大小

考点:滑轮(组)的机械效率
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小华今年a岁,爸爸的年龄是他的3倍多4岁,爸爸今年______岁.

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有关胃的叙述,错误的是()

A.胃的上口接食管,称为贲门

B.胃的下口接十二指肠,称为幽门

C.胃贲门口下缘水平线以下为胃底

D.贲门位于胃的内侧壁

E.以贲门为中心半径2.5cm的区域称贲门区

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Serena is a non-executive director of two companies, Lotsamunny Bhd, a large public company and Minibiz Sdn Bhd, a small private company which has only five shareholders.Serena urgently requires a loan of RM150,000, partly for meeting medical expenses of her mother, who requires an urgent operation, and partly to finance the purchase of a car for her husband.Serena is contemplating obtaining a loan from either of the two companies.Required:Advise Serena as to the legality of such a loan under the Companies Act, 1965 and whether your answer would differ if Minibiz Sdn Bhd is an exempt private company. (10 marks)

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CatiaV5使用smg计算刀具路径完成,但是以批次方式产生NC码时输出的NC程序,内容却只有文件头档尾。没有加工坐标点,为什么?

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安全阀一般每年至少应校验一次,对于弹簧直接载荷式安全阀,经使用经验证明和检验单位确认可以延长校验周期的,使用单位向省级或其委托的地﹙市﹚级安全监察机构备案后,其校验周期可以延长。但最长不超过()年。

A.2

B.3

C.4

D.5

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