要在墙上钉牢一根木条,至少要钉______颗钉子,根据是:______.

题型:填空题

问题:

要在墙上钉牢一根木条,至少要钉______ 颗钉子,根据是:______.

考点:直线,线段,射线
题型:填空题

某研究性学习小组为探究铜、锌与浓盐酸的反应,设计实验探究方案如下:

实验用品:纯锌片、铜片、37%的浓盐酸、蒸馏水、氯化钾溶液、稀硝酸溶液

实验记录:

背影资料:

请你参与以下探究:

(1)实验A反应速度明显比B小,原因是______.

(2)根据“铜位于金属活动顺序表氢之后,与稀盐酸不反应,而在实验中加热时又产生气体”的事实,作出如下推断:

①有同学认为“实验C中加热时产生的气体是溶解在溶液中的H2”,你认为是否有道理,理由是______.

②某同学作了如下猜想:是否成立?请你设计实验方案加入验证.

猜想验证方法预测现象及结论
认为铜片中可能含有锌等杂质
(3)某同学对实验D中的白色沉淀进行分析:“不可能是CuCl2,因为CuCl2能溶于水且溶液显蓝色;也不可能是ZnCl2,因为稀释后溶液更稀,不会析出ZnCl2晶体.若利用资源卡片资料大胆猜想,白色沉淀可能是CuCl.请你帮他设计验证方案(若有多处方案,只设计两个).

猜想预计验证方法猜想的现象与结论
白色沉淀是氯化亚铜
(4)指导老师肯定了实验D中的白色沉淀是CuCl;并措出生成沉淀的原因,实际上是[CuCl4]2等离子与CuCl(s)、Cl三者之间所形成的沉淀溶解平衡移动的结果.请写出这一平衡关系式(用离子方程式表示):______.

题型:填空题

定痫丸适用于治疗痫证之()

A.风痰闭阻证

B.痰火扰神证

C.瘀阻脑络证

D.心脾两虚证

E.心肾亏虚证

题型:填空题

奠定了班级组织的理论基础的是《大教学论》的作者()

A、夸美纽斯

B、埃拉斯莫斯

C、杜威

D、凯洛夫 

题型:填空题

People in the United States honor their parents with two special days: Mother’s Day, on the second Sunday in May, and Father’s Day, on the third Sunday in June. These days are set aside to show love and respect for parents. They raise their children and educate them to be responsible citizens. They give love and care. These two days offer a chance to think about the changing roles of mothers and fathers. More mothers now work outside the home. More fathers must help with child-care.

These two special days are celebrated in many different ways. On Mother’s Day people wear carnations. A red one stands for a living mother. A white one shows that the mother is dead. Many people attend religious services(宗教仪式) to honor parents. It is also a day when people whose parents are dead visit their graves. On these days, families get together at home and in restaurants. They often have outdoor BBQs for Father’s Day. These are days of fun and good feelings and memories.

Another tradition is to give cards and gifts. Children make them in school. Many people make their own presents. These are valued more than the ones bought in stores. It is not the value of the gift that is important, but it is “the thought that counts”. Greeting card stores, florists, candy makers, bakeries, telephones companies and other stores do a lot of business during these holidays.

小题1:Which is NOT a reason for children to show love and respect for parents?

A.Parents bring children

B.Parents give love and care to children

C.Parents educate children to be good persons.

D.Parents pass away before children grow up小题2:What do you know from the passage?

A.Mother’s Day and Father’s Day are both in May.

B.Fewer women worked outside the home in the past

C.Not all the children respect their parents

D.Fathers are not as important as mothers at home小题3:Which do you think is right about “carnation”?

A.It only has two kinds of color.

B.It is a special kind of clothes people wear on Mother’s Day or Father’s Day.

C.It’s a kind of flower showing love and best wishes.

D.People can wear carnations only on the second Sunday in May.小题4:What do you think “florists” do?

A.They sell flowers

B.They made bread or pastry

C.They offer enough room for having family parties.

D.They sell special clothes for Mother’s Day and Father’s Day.

题型:填空题

患儿,女,9个月。间断腹泻2个月,面色苍白1个月。足月经 * * 分娩(顺产),母乳喂养,4个月添加辅食。仓体:皮肤黏膜苍白,头发稀黄,颜面稍娃水肿,肝脾轻度肿大。血红蛋白80g/L,红细胞数2.0×1012/L。骨髓巨幼红细胞增生。

该患儿目前最好的治疗方法

A.无需治疗
B.输血
C.口服叶酸及肌注维生素B12
D.口服铁剂、维生素C
E.细胞毒药物化疗

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