把凸透镜正对太阳光,可在距凸透镜10cm处得到一个最小最亮的光斑.若用此凸透镜来

题型:填空题

问题:

把凸透镜正对太阳光,可在距凸透镜10cm处得到一个最小最亮的光斑.若用此凸透镜来观察邮票上较小的图案,则邮票到凸透镜的距离应______.

考点:凸透镜对光的作用焦点,焦距
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(2009·湖北楚星研究所)下列词语中,加点字的读音完全无误的一组是( )  

A.洞穴(xuè)洗漱(shù)福祉(zhǐ)妍媸毕露(lù)  

B.伫(chú)立创(chuāng)伤缱绻(qián quǎn)惊魂甫(fǔ)定  

C.伉俪(kàng lì)溘(kè)然剜(wǎn)心朝暾(dūn)夕月  

D.安谧(mì)憎恶(zēngwù)哺(bǔ)育不系(xì)之舟

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短文改错。

     假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。

文中共有10处语言错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏词符号(∧),并在其下面写出该加的词。

删除:把多余的词用斜线(﹨)划掉。

修改:在错的词下划一横线(___),并在该词下面写出修改的词。

注意:1.每处错误及修改均仅限一词;

         2. 只允许修改10处,多者(从第11处起)不计分。

     Last Sunday morning, when I was having a walk in the park near my home, I came across

a crew make a new film with one of my favourite actor. I didn't have my camera with me at that

time, but I rushed back home to get. Unfortunately, by the time I got back, they have finished the

scene and actor couldn't be seen everywhere. I was really disappointing and about to leave when

he walked out a building. He was right there in the front of me! Icouldn't believe my luck-not only

did I had my photo taken with him, but he signed his name on my shirt!

_______________________________________________________________________________

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承担社会责任对于我们每个人来说应该是义不容辞的,因为它可以让我们的社会更加美好、和谐,下列行动中属于公民勇于承担社会责任的是[ ]

①中国青年志愿者行动

②义务植树造林活动

③向“希望工程”捐款活动

④“863计划”

⑤春蕾行动

⑥义务赈灾活动

⑦“保护母亲河行动”

A.①②③④

B.②③④⑤

C.③④⑤⑥

D.①②③⑤⑥⑦

题型:填空题

重型胎盘早剥,下列正确的是()

A.子宫处于低张状态

B.胎位不正,胎心不清

C.贫血程度与外出血量成正比

D.比妊娠周数小

E.腹痛程度与胎盘后积血多少成正比

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