陡槽段混凝土衬砌为什么分缝?接缝有哪几种型式?并用何种材料止水?

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问题:

陡槽段混凝土衬砌为什么分缝?接缝有哪几种型式?并用何种材料止水?

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关于以下四种光学仪器的成像情况说法正确的是(  )

A.放大镜成正立放大的实像

B.照相机成倒立缩小的实像

C.潜望镜成正立等大的虚像

D.幻灯机成正立放大的实像

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成熟乳为产后几日后分泌的乳汁()。

A.7天

B.10天

C.14天

D.16天

E.20天

题型:问答题 简答题

下列关于骨纤维异常增殖症的X线表现,不正确的是()

A.股骨、胫骨和肋骨多见

B.不累及面颅骨

C.呈囊状改变的骨纤维异常增殖症边缘有硬化

D.内可有粗大骨纹

E.可呈单发或多发的虫蚀样骨破坏

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从事餐饮服务的企业不得伪造、涂改餐饮服务许可证,但可以出借餐饮服务许可证。

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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.

10()

A.drop

B.short

C.cut

D.lack

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