如图表示配制100mL0.100mol•L-1Na2CO3溶液的几个关键实验步骤

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问题:

如图表示配制 100mL 0.100mol•L-1 Na2CO3溶液的几个关键实验步骤和操作,据图回答下列问题:

(1)用托盘天平称取Na2CO3•10H2O 的质量是______.

(2)步骤E中将一玻璃仪器上下颠倒数次,该仪器的名称是______.

(3)步骤B通常称为转移,步骤A通常称为______.

(4)将上述实验步骤A→F按实验过程先后次序排列______.

考点:配制一定物质的量浓度的溶液
题型:问答题

I never expected that I would be so busy. Why can’t there be 25 hours a day?” complained Lou Ran in Hong Kong as final exams were going on.

The 18-year-old girl was Fujian Province’s ___48__ scorer in last year’s college entrance examination. After leaving school, she chose the Chinese University of Hong Kong __49__ both Peking University and Tsinghus University promised her a place.

“I want to experience a more international school and social life in Hong Kong. I’m __50__ in journalism, so Hong Kong will surely help widen my horizons,” Liu said.

It is about four months since Liu Ran set __51_ on Hong Kong. She missed home a lot at the beginning, because of the food and __52__problems.

“The canteen offers mostly Western or Guangdong food, but it’s convenient to cook for ourselves in our dorm if we like. People speak Cantonese and almost all classes are in English,” Liu explained.

Her English and Cantonese are now improving, but she still needs more __53_ to adapt to the new environment.

“I’m happy that I made the right __54__ to study here. With a mix of the Eastern and Western__55__, there is so much to discover and learn,” she said.

题型:问答题

心理评估通常不包括()

A.临床访谈

B.临床观察

C.心理测验

D.心理咨询

E.评定量表

题型:问答题

问题描述:在客户端查询日记账时,系统提示出错:91-未设置对象变量或withblock变量解决方法?

题型:问答题

在大雪期间“雪季危险街道”标志的意义何在?()

A.只有负有紧急任务的车辆才能在此街道行驶

B.一切车辆需要装置链条或防雪轮胎才能行驶的街道

C.只有警车可行驶的街道

D.在雪铲清以前一切车辆不准在此街道行驶

题型:问答题

现有A和B两个肉牛品种,A品种牛的细胞组成可表示为A细胞核、A细胞质,B品种牛则为B细胞核、B细胞质。

“多利”面部的毛色是(),请根据遗传学原理说明判断的原因是:()

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