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问题 不定项选择

不可伸长的轻细绳AO和BO的结点为O，在O点悬吊电灯L，OA绳处于水平，电灯L处于平衡，如图所示。如果保持O点位置不变，改变OA的长度，使A点逐渐上移至C点，随着A点逐渐上移，细绳AO的拉力将

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A．逐渐增大

B．逐渐减小

C．先减小再增大

D．先增大再减小

答案

答案：C

判断题

硬质合金分为钨钴类和钨钴钛类，常用牌号是W18Cr4v和W6Mo5Cr4V2。
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单项选择题

Start-up companies financed by venture capitalist have a much lower failure rate than companies financed by other means. Source of financing, therefore, must be a more important causative factor in the success of a start-up company than are such factors as the personal characteristics of the entrepreneur, the quality of strategic planning, or the management structure of the company.
Which of the following, if true, most seriously weakens the argument above

A．Venture capitalists tend to be more responsive than other sources of financing to changes in a start-up company’s financial needs.

B．The strategic planning of a start-up company is a less important factor in the long-term success of the company than are the personal characteristics of the entrepreneur.

C．More than half of all new companies fall within five years.

D．The management structures of start-up companies are generally less formal than the management structures of ongoing businesses.

E．(E) Venture capitalists base their decisions to fund start-up companies on such factors as the characteristics of the entrepreneur and quality of strategic planning of the company.
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