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问题 单项选择题

关于动脉粥样硬化的发病机制，目前被较多学者支持的是（）

A.脂质浸润学说

B.血小板聚集和血栓形成学说

C.单克隆学说

D.损伤反应学说

E.以上都不正确

答案

参考答案：D

问答题

原子核中带正电的粒子是______．

A．质子      B．中子      C．电子      D．原子．
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单项选择题

Companies considering new cost-cutting manufacturing processes often compare the projected results of making the investment against the alternative of not making the investment with costs, selling prices, and share of market remaining constant.
Which of the following, assuming that each is a realistic possibility, constitutes the most serious disadvantage for companies of using the method above for evaluating the financial benefit of new manufacturing processes

A．The costs of materials required by the new process might not be known with certainty.

B．In several years interest rates might go down, reducing the interest costs of borrowing money to pay for the investment.

C．Some cost-cutting processes might require such expensive investments that there would be no net gain for many years, until the investment was paid for by savings in the manufacturing process.

D．Competitors that do invest in a new process might reduce their selling prices and thus take market share away from companies that do not.

E．(E) The period of year chosen for averaging out the cost of the investment might be somewhat longer or shorter, thus affecting the result.
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