两份完全相同的稀盐酸分别与等质量的锌粉和镁粉反应,下列情况无法用所给图象表示的是

题型:选择题

问题:

两份完全相同的稀盐酸分别与等质量的锌粉和镁粉反应,下列情况无法用所给图象表示的是.

A.x轴表示加入金属质量

B.x轴表示加入稀盐酸的质量

C.x轴表示反应时间,Zn与稀盐酸恰好完全反应

D.x轴表示反应时间,Mg和Zn都有剩余

考点:金属的化学性质
题型:选择题

湿式系统和干式系统的联动控制设计,应符合下列哪些规定:()。

A、联动控制方式,应由湿式报警阀压力开关的动作信号作为触发信号,直接控制启动喷淋消防泵,联动控制不应受消防联动控制器处于自动或手动状态影响

B、手动控制方式,应将喷淋消防泵控制箱(柜)的启动、停止按钮用专用线路直接连接至设置在消防控制室内的消防联动控制器的手动控制盘,直接手动控制喷淋消防泵的启动、停止

C、水流指示器、信号阀的启动和停止的动作信号应反馈至消防联动控制器

D、压力开关、喷淋消防泵的启动和停止的动作信号应反馈至消防联动控制器

题型:选择题

阅读理解

     In 1993,I had my first opportunity to visit Russia as a representative of the University of California.I

was there to provide some technical assistance in the area of agricultural labor management."The Russians

are very polite people," I had been tutored before my arrival.One of my interpreters,once I was there,

explained that a gentleman will pour the juice for the ladies and show other courtesies(礼节).

     Toward the end of my threeweek trip I was invited by my young Russian host and friend Nicolai Vasile

vich and his lovely wife Yulya out to dinner.At the end of a wonderful meal Yulya asked if I would like a

banana.I politely declined and thanked her,and explained I was most satisfied with the meal.My mind was

racing,"What do I do? Do I offer her a banana even though they are as close to her as they are to me?

What is the polite thing to do?"

     "Would you like a banana?" I asked Yulya.

     "Yes," she smiled,but made no attempt to take any of the three bananas in the fruit basket."What now?"

I thought.

     "Which one would you like?" I asked.

     "That one," she pointed at one of the bananas.So all the while thinking about Russian politeness,I

picked the banana Yulya had pointed at and peeled it half way and handed it to her.Smiles in Yulya and

Nicoli's faces told me I had done the right thing.After this experience I spent much time letting the world

know that in Russia,the polite thing is to peel the bananas for the ladies.Sometime during my third trip I was

politely disabused(纠正).

     "Oh no,Grigorii Davidovich," a Russian graciously corrected me."In Russia,when a man peels a banana

for a lady,it means he has a romantic interest in her." How embarrassed I felt!

1.The main purpose of the writer is probably to tell us ________.

A. what good manners are in Russia

B. the different ways to eat bananas in Russia

C. his interesting working experience in Russia

D. the cultural difference he has experienced in Russia

2.The author first went to Russia to ________.

A. teach agricultural labor management

B. work as an assistant in a Russian university

C. offer help in a certain area

D. meet some old friends there

3.Why most probably did Yulya and Nicolai smile when the author handed the peeled banana?

A. They wanted to hide their anger.

B. They were secretly laughing at the author.

C. They were very happy with what the author did.

D. They showed their understanding of the author.

4.After his experience with Yulya,the author probably thought ________.

A. he knew how to be polite to a lady in Russia

B. he had made a funny mistake

C. one should be careful when peeling bananas for ladies

D. one should not peel bananas for ladies

题型:选择题

《吉尔伽美什》中描述英雄经历种种艰难,终于找到了人类的始祖()。

A.达摩

B.乌特那庇什提牟

C.朱庇特

D.加拉

题型:选择题

试生产后却不具备环境保护验收条件的建设项目,建设单位应当在试生产的( )个月内,向有审批权的环境保护行政主管部门提出该建设项目环境保护延期验收申请,说明延期验收的理由及进行验收的时间。

A.1
B.2
C.3
D.4

题型:选择题

在实施心血管疾病健康教育第二年,某市政府宣布,在所有副食商店不再出售肥肉,在全市范围内提倡禁烟活动属于(卫生政策的颁布)()。

A.历史性因素

B.成熟因素

C.观察偏倚

D.人为因素

E.回归因素

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