人体甲状旁腺分泌甲状旁腺素，当人体内血钙浓度下降时，甲状旁腺_爱下问搜题

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问题选择题

人体甲状旁腺分泌甲状旁腺素，当人体内血钙浓度下降时，甲状旁腺素分泌增加，作用于骨和肾脏使血钙浓度上升。甲状腺C细胞分泌降钙素，当血钙浓度上升时，降钙素分泌增加，作用于骨等使血钙浓度下降。下列关于血钙的叙述，错误的是[ ]

A．血钙浓度降低可引起肌肉抽搐

B．甲状旁腺素和降钙素对血钙的调节表现为协同作用

C．人体血钙浓度在体液调节下处于动态平衡

D．食物中的钙可以通过消化道吸收进入血液

答案

答案：B

问答题简答题

某商场主体结构采用现浇钢筋混凝土框架结构，基础形式为现浇钢筋混凝土筏形基础，地下2层，地上8层，混凝土采用C30级，主要受力钢筋采用HRB335级，在主体结构施工到第5层时，发现第2层部分柱子承载能力达不到设计要求，聘请有资质的检测单位检测鉴定仍不能达到设计要求，拆除重建费用过高，时间较长，最后经原设计院核算，能够满足安全和使用要求。

该钢筋分项工程质量验收包括哪些内容？如何组织验收钢筋工程质量？

完形填空

阅读下面短文，掌握其大意，然后从1-15各题所给的A、B、C、D四个选项中，选出最佳选项。
Several factors make a good newspaper story. First， 1  ，it must be new. But since TV can react to events so quickly, this is often a problem for    2 . They usually respond    3  it in one of three ways.
One by providing   4  detail, comment or background information.
One by finding a new   5 on the day’s major stories.
One by printing completely different stories which   6  doesn’t broadcast.
What else? Well—it also has to be   7 . People don’t want to read about    8  , everyday life. Because of this, many stories   9  some kind of conflict or danger. This is one reason why so much news seems to be   10 news , “ Plane lands safely—no-one hurt ”doesn’t sell newspapers. “Plane 11 —200 feared dead !” does .
Next, there’s human interest. People are interested in other   12  —particularly in the rich, famous and powerful. Stories about the private lives of pop singers, actors, models, politicians,   13 , all appear regularly in certain newspapers .
Finally, for many editors,   14  is an important factor, too. They prefer stories about people, places and events which their readers know. That’s   15  the stories in Tokyo’s newspapers are often very different from the stories printed in Paris, Cairo, New York or Buenos Aires.

B．publications

D．broadcasters

A．conventional

C．professional

D．informative

A．in addition

B．in any case

C．for example

A．personality

D．familiarity