归纳电能的优点有： ①_______ _； ②_______ _。

下列国际工程保险项目中，（）可以计入直接费中。

A.工程一切险

B.第三者责任险

C.人身意外保险

D.材料设备运输保险

E.施工机械保险

在供方选择过程中，对提供主要物资的新的供方，应要求其提供充分的质量证明文件，以证实其质量保证能力。（）不属于质量证明。

A.供方多年供货业绩综合评价

B.供方质量管理体系对按要求如期提供稳定质量产品的保证能力

C.供方其他用户对其产品质量的反馈

D.供方绩效评估结果

下面四个图标，哪一个不是安装Windows98时由系统建立的（）。

A.我的电脑

B.回收站

C.我的文档

D.AutoCAD2000

中小企业的财务目标一般包括（）

A.销售收入目标

B.利润目标

C.税金目标

D.筹资目标

E.资金周转目标

It’s all annual back-to-school routine. One morning you wave goodbye, and that (1) evening you’re burning the late-night oil in sympathy. In the race to improve educational standards, (2) are throwing the books at kids. (3) elementary school students are complaining of homework (4) What’s a well-meaning parent to do.As hard as (5) may he, sit back and chill, experts advise. Though you’ve got to get them to do it, (6) helping too much, or even examining (7) too carefully, you may keep them (8) doing it by themselves. "I wouldn’t advise a parent to check every (9) assignment," says psychologist John Rosemond, author of Ending the Tough Homework. "There’s a (10) of appreciation for trial and error. Let your children (11) the grade they deserve. " Many experts believe parents should gently look over the work of younger children and ask them to rethink their (12) . But "you don’t want them to feel it has to be (13) ," she says.

That’s not to say parents should (14) homework-first, they should monitor how much homework their kids (15) . Thirty minutes a day in the early elementary years and an hour in (16) four, five, and six is standard, says Rosemond. For junior-high students it should be " (17) more than an hour and a half," and two for high school students. If your child (18) has more homework than this, you may want to check (19) other parents and then talk to the teacher about (20) assignments.

17（）

A.about

B.no

C.much

D.few