皮皮学，免费搜题
登录
搜题
【简答题】
根据凸轮轴的 和同名凸轮的 可判定发动机的发火次序。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【多选题】我国及 IEC (国际电工委员会)都对安全电压的上限值进行了规定,即工频下安全电压的上限值为( ) V ,其电压等级有 42V 、 36V 、( ) V 、12 V 、( ) V 。同时规定:高度不足 2.5M 的照明装置、机床局部照明灯具、移动行灯等,其安全电压可采用( ) V 为安全电压。
A.
50
B.
24
C.
6
D.
12
【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.
相关题目：
参考解析：
知识点：
题目纠错 0
发布
