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【简答题】
函数y=lg(3-4x+x 2 )的定义域为M,函数f(x)=4 x -2 x+1 (x∈M). (1)求M; (2)求函数f(x)的值域; (3)当x∈M时,若关于x的方程4 x -2 x+1 =b(b∈R)有实数根,求b的取值范围,并讨论实数根的个数.
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【单选题】“他喜欢了胡歌”是错句,而“他喜欢上了胡歌”却是正确的句子,原因在于:
A.
具有了状态形容词的某些特点
B.
不能受程度副词修饰
C.
可以做结果补语
D.
不可以做定语
【判断题】Jf3B5306在3/2开关接线中,当一串中的中间开关拒动时,应采取远方跳闸装置,使线路对端开关跳闸并闭锁其重合闸装置。
A.
正确
B.
错误
【多选题】法约尔认为管理这一职能活动由哪些职能组成的?
A.
计划
B.
组织
C.
指挥
D.
协调
E.
控制
【单选题】首饰最早出现于人类的(    )。
A.
石器时代
B.
近代
C.
现代
D.
古代
【单选题】下列有关膳食指南,哪一条是正确的
A.
食物多样、谷类为主
B.
蔬菜水果要少吃
C.
奶类豆类要少吃
D.
多吃肉类
【多选题】当中性点不接地系统中有一相发生金属性接地后,采取逐条拉路法选线时,若在拉开某一线路开关时出现()现象,可确定此线路中有接地点。
A.
三相相电压恢复正常
B.
三相线电压正常
C.
一相对地电压为零,另两相升高到3倍
D.
接地光字消失
【单选题】“他喜欢了胡歌”是错句,而“他喜欢上了胡歌”却是正确的句子,原因在于:
A.
结果不语“上”具有“有界性”,“有界性”的成分可以与完成态“了”共现
B.
前者是“喜欢”与“了”在时态上不兼容,后者是时量上冲突
C.
“喜欢”是一个经历态词,“了”是完成态词
D.
“喜欢”是一个完成态词,“上”是结果补语
【单选题】I bought ____ of the three books because I thought they were not suitable for me to read. A. all B. both C. either D. none
A.
B.
C.
D.
D
【单选题】在一台半断路器接线中,当只有两串接线时,在进、出线加装隔离开关的目的是下列哪一项? ( )
A.
检修断路器时,隔离电源,保证检修安全
B.
检修线路或电源时,避免解环运行,提高供电可靠性
C.
可以用来对电源或线路停送电
D.
可以用于倒闸操作,拉合小电流电路
【单选题】Because postage rates are rising, Home Decorator magazine plans to maximize its profits by reducing by one half the number of issues it publishes each year. The quality of articles, the number of arti...
A.
With the new postage rates, a typical issue under the proposed plan would cost about one-third more to mail than a typical current issue would.
B.
The majority of the magazine's subscribers are less concerned about a possible reduction in the quantity of the magazine's articles than about a possible loss of the current high quality of its articles.
C.
Many of the magazine's long-time subscribers would continue their subscriptions even if the subscription price were increased.
D.
Most of the advertisers that purchase advertising space in the magazine will continue to spend the same amount on advertising per issue as they have in the past.
E.
Production costs for the magazine are expected to remain stable.
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