题目内容

Listen to the following speech twice and fill in the blanks with what you hear. Ladies and gentleman:My name is David Truman and I am the 1._______ of Simons Facilities Corporation. Thank you for inviting me to speak here today about future energy technologies. 2.________, let me introduce our company, SFC, to you.Simply put, SFC is one company with two lines of 3._______—power and water, and our history dates back to over 100 years ago. Today we are one of the 50 largest companies in the UK. More than 20,000 of our employees build and 4._______ power and water facilities in England, Scotland and Wales.With this 5.__________ as background, now I would like to come to the topic of my speech today: What new energy technologies are there and where can they take us?

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下列物质中可用于直接配制标准溶液的是:

A. 无水 Na2CO 3
B. 浓 HCl ( G.)
C. 固体 K2Cr2O7(G.R.);
D. 固体 Na 2S 2O3·5H 2O ( C .)

在酸碱滴定分析中可以作为基准物的有:

A. 硼砂
B. 氨水
C. 盐酸
D. 氢氧化钠

硼砂(Na2B4O7•10H2O)作为基准物质用于标定盐酸溶液的浓度,若事先将其置于干燥器中保存,则对所标定盐酸溶液浓度的结果影响是( )

A. 偏高
B. 偏低
C. 无影响
D. 不能确定

欲配制1000mL 0.1mol/L HCl溶液,应取浓盐酸(12mol/L HCl) ( )mL。

A. 0.84mL
B. 8.4ml
C. 12ml
D. 1.2ml

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