血液中含有钙,它与血液凝固有关.如果设法除去血液中的钙,可阻止血液凝固.请你协助

题型:解答题

问题:

血液中含有钙,它与血液凝固有关.如果设法除去血液中的钙,可阻止血液凝固.请你协助完成如下实验,证明这一结论.

(1)取两支试管,编为1号和2号,1号试管中加入少量______物质,2号试管中不加入.

(2)抽取动物体内的血液20毫升,分成两等份,分别加入到两支试管中.

(3)将试管静置一段时间后,可见1号试管中的血液______,2号试管中的血液______.

(4)1号试管中加入少量物质的目的是______,选取2号试管的目的是______.

考点:血液的组成和功能
题型:解答题

在集合{1,2,3}中先后随机地取两个数,若把这两个数按照取的先后顺序组成一个二位数,则“个位数与十位数不相同”的概率是______.

题型:解答题

语法填空 (共15小题,每小题l分,满分15分)

根据照句子结构的语法性,在下面空格处填入—个适当的词或使用括号中词的适当形式填空,并将答案填写在答题卡标号为26—40的相应位置上。

小题1: There is no doubt that she is a woman with great_________ (ambition)plan.

小题2: ______________ (fortunate), I achieved my goal finally.

小题3:Could you ask some __________(assist) to help me tonight?

小题4:He has been used to __________ (adapt) to new situations here.

小题5: After he lost one leg, he was ________ (able) to play football game any more.

小题6:As she turned around, she___________ (find) a man trying to steal her money.

小题7:The little girl was not allowed ___________ (go) outside alone at night.

小题8:They went out of the cinema, ___________(talk) about what they had seen.

小题9:Tim refused __________ (accompany) by his father when he went for a haircut.

小题10: The picture taken with her reminded me of the days, _________ we spent in Hainan.

小题11: George didn’t recognize the scientist who is ________ (know) for his theory.

小题12: Billy went to visit Harbin ____________ some companions last year.

小题13:A team of rescue workers prevented the heart-broken man ____________ suicide.

小题14:To learn English well, I spend at least __________ hour reading and writing.

小题15: I am going to join__________ really interests me without hesitation.

题型:解答题

关于社会救助,下列描述中错误的是()。

A.目的是保障当事人的生命安全和基本权利

B.是对因自然、个人及社会等各种原因而导致基本生活陷人困境者的救助

C.是社会保障制度的最初级、最基本的组成部分

D.只是向困难人群发放食物、生存物资和金钱

题型:解答题

既能凉血止血,又能清肺胃热、清热利尿的药物是()

A.白茅根

B.地榆

C.侧柏叶

D.苎麻根

E.小蓟

题型:解答题

人身保险营销体制可以分为()、()和()。

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