解下列方程组:(1)x=y-12x+y=4 (2)2s+3t=-14s-9t=8

题型:解答题

问题:

解下列方程组:
(1)
x=y-1
2x+y=4
             
(2)
2s+3t=-1
4s-9t=8
考点:二元一次方程组的解法
题型:解答题
已知f(x)=
2x-1
2x+1

(1)求函数f(x)的定义域、值域.
(2)讨论f(x)的单调性.
题型:解答题

在电力电缆线路安全保护方面,江河电缆保护区一般不小于线路两侧各()所形成的两条平行线内的水域;中、小河流一般不小于线路两侧各()所形成的两条平行线内的水域。

A.50m.50m

B.50m,75m

C.100m,50m

D.100m,75m

题型:解答题

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     Lately, there is a rising trend in families choosing to homeschool their child than send their child to a

traditional educational institution. Let's look at some of the benefits of homeschooling.

     1. Flexible Schedule

     Homeschooling enables a flexible schedule. 1_____ With homeschooling, your child can start homeschooling at 9 am or later depending on your preferred schedule. You can schedule your child's homeschooling education

as you see fit with materials or subjects that may be not available in a traditional school.

     2. Individual attention

     With homeschooling, your child gets all the individual attention. For example, if your child is weak in maths,

you could devote more time and energy to teaching maths.

     Your child's homeschooling schedule can be adjusted for that. For example, if your child is better at science

than at maths, simply devote more homeschooling hours to maths and cut back on science. With

homeschooling, the choice is yours. 2_____

     3. Family Activity

     The schooling of the child can become an extended family activity. Examples are field trips and experiments.

Plus, the child also receives more quality time with his/her parents. 3_____ The child is also free of any negative

peer pressure or influences.

     4. 4_____ 

     With homeschooling, the child does not need to prove his/her abilities to other children. Parents are able to

plan the learning program according to his strengths and weakness.

     Parents can also change the curriculum to suit the learning style of the child. 5_____ Some children even

learn better from experiencing or seeing things in action.

A. No peer pressure

B. Religion Learning

C. Traditional schools can't do that.

D. There is more time for family bonding.

E. For example, the child needn't wake up at 7 every morning.

F. Plus, it is quite impossible to provide individual attention to all students.

G. For example, some children learn better from reading while others need to write.

题型:解答题

本大题要求判断所给出的条件能否充分支持题干中陈述的结论,阅读条件(1)和(2)后选择:

  • (A) 条件(1)充分,但条件(2)不充分.
  • (B) 条件(2)充分,但条件(1)不充分.
  • (C) 条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
  • (D) 条件(1)充分,条件(2)也充分.
  • (E) 条件(1)和(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.

不等式(x4-4)+(x2-2)<0成立.

题型:解答题

属于油浸式电流互感器金属膨胀器检修的关键工艺质量控制的是()。

A.注油完毕后,应按照厂家说明书静置排气

B.考虑环境温度,注油油位在最高刻度及最低刻度之间,同间隔三相油位保持一致

C.各部螺丝紧固,膨胀器的本体与膨胀器连接管路畅通

D.操作时注意清洁卫生,严防异物掉进互感器内部

更多题库