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【单选题】
遗嘱继承是指于继承开始后，继承人按照被继承人生前所立的合法有效的遗嘱进行继承的一种继承制度。关于遗嘱的特征，下列说法错误的是()。A.
遗嘱是一种单方法律行为
B.
遗嘱是遗嘱人独立的民事行为
C.
遗嘱人可以自己随意制定遗嘱的形式
D.
遗嘱是于遗嘱人死亡后才发生法律效力的民事行为
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【多选题】人生实践中,人们往往会遇到各种矛盾和挫折,这就需要端正人生态度。下列选项中,不正确的人生态度是( )。
A.
人生是一次冒险的游戏
B.
人生苦短,当及时享受
C.
人生就是选择,个人当为自己的行为负责
D.
人应面对现实,接受挑战
【单选题】下列选项中,正确的人生态度是
A.
“浮生如梦、及时行乐”
B.
“今朝有酒今朝醉，坐一天和尚撞一天钟”
C.
“人生不能白过，美好的生活是奋斗出来的”
D.
“人不能和命相抗衡，命里有时终需有”
【简答题】国际电工委员会(IEC)规定安全电压限定值为( )V。
【单选题】Which of the following accurately describes a major difference between a monopolist and firms in perfectly competitive markets?
A.
The monopolist maximizes profit; firms in perfectly competitive markets maximize sales.
B.
The monopolist may earn long-run economic profit; firms in perfectly competitive markets cannot.
C.
The monopolist is a price taker; firms in other markets are price searchers.
D.
The monopolist may earn short-run profit; firms in perfectly competitive markets cannot.
【单选题】Which of the following best explains why a monopolist's marginal revenue is less than the sale price?
A.
To sell more units, a monopolist must increase the price on all units sold.
B.
As a monopolist expands output, its average total cost declines.
C.
When a firm has a monopoly, consumers have no choice other than to pay the price set by the monopolist.
D.
When a monopolist reduces price in order to sell more units, it must lower the price of some units that could otherwise have been sold at a higher price.
【简答题】已知在△ABC中，∠A=60°，∠B=75°，AB= 6 ，则BC=______．
【单选题】A major difference between a single-price monopolist and a perfectly competitive firm is that the
A.
monopolist can maximize profit by setting the price of the output where demand is inelastic.
B.
monopolist can always increase its profits by increasing the price of its output.
C.
monopolist's marginal revenue is less than price.
D.
monopolist is guaranteed to earn an economic profit.
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