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问题 单项选择题

框架抗震没计中应遵循( )原则。
(Ⅰ)强柱弱梁；(Ⅱ)强剪弱弯；(Ⅲ)强梁弱柱；(Ⅳ)强节点、强锚固。

A．Ⅰ、Ⅱ、Ⅲ
B．Ⅰ、Ⅱ、Ⅳ
C．Ⅱ、Ⅲ
D．Ⅱ、Ⅲ、Ⅳ

答案

参考答案：B

阅读理解

Most American families are smaller than the families in other countries. They have one or two parents and one or two children. Children in the US will leave their parents’ home when they grow up. They usually live far from their parents because they want to find good jobs. They often write to their parents or telephone them. And they often go to visit their parents on holiday. Parents usually let their children choose their own jobs. Americans think it important for young people to decide their lives by themselves. Children are asked to do some work around their house. And in many families, children are paid for doing some housework so that they learn how to make money for their own use.

小题1:There are _____ people in most American families.

A．1—2

B．2---4

C．3---4

D．4---6小题2:When children grow up, they leave their parents’ home to _____.

A．get married

B．find good jobs

C．be free

D．study小题3:They visit their parents ______

A．on weekdays

B．at weekends

C．at any time

D．on holiday小题4:Which of the following statements is wrong?

A．Children have the freedom to choose their own jobs.

B．Parents don’t ask their children to do housework.

C．Parents think it important for children to make their own decision.

D．When children grow up, they usually live far away from their home.小题5:Some parents pay their children for doing housework because ______.

A．children can learn how to make money for themselves.

B．their children asked them to do so

C．they are rich

D．the children work hard
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填空题

下列所示装置图是实验室制取气体的常用装置。请回答：

⑴写出图中标号为①~②的仪器名称：①           ；②           。

⑵小捷用上图中的B、C装置，制取并收集一种我们现在已学过的常见气体。小捷所制取的气体可能是       。

①请写出制取该气体的化学式表达式                                    。

②检查装置的气密性：先将B装置的导管浸入水中，然后用手握住试管外壁，观察到导管口     （填“有”或“没有”）气泡冒出，表明B装置不会漏气。

③如何检验C中收集到的气体？请写出有关的操作和现象。

                                                                    。

⑶氨气（NH3）在常温下是一种无色、有刺激性气味、密度比空气小、极易溶于水的气体。实验室常用氯化铵（NH4Cl）和氢氧化钙的固体混合物加热制取氨气，同时还生成氯化钙和水。根据上述信息回答下列问题：

①氨气具有的物理性质有                              。（至少写两点）

②根据上面所给的装置图，制取并收集氨气应选择    和    （填字母序号）

③写出实验室制取氨气的化学式表达式                                  。

⑷小亮同学用A、E装置制取并收集氧气。

请写出在A装置中高锰酸钾分解的化学式表达式                          。

实验结束后，洗涤试管时发现试管底部破裂，请分析造成这一后果的可能原因：

                                                     （写出一点即可）。
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