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【简答题】
Write an answer to one of the questions 2—4 in this part. Write 200—250 words on the separate answer paper provided. 1. Question 2 You have learnt of a new position open to candidates from within your company. You have been advised to send a letter to the manager of the division where the new job has been created in order to inform. him of your interest in this position. Write the letter to the manager: expressing your interest in the new position summarizing your work experience and qualifications indicating your wish to maintain further contact Question 3 Your company has decided to institute changes in its policy about working hours in response to the needs of its changing workforce in a large city. You have been asked to write a proposal for appropriate changes at the moment. Write your proposal, including the following: a description of employees’ problems with the existent policy about working hours a recommendation of a change an explanation of possible benefits from the proposed change Question 4 Your company needs veteran employees to appraise the newly employed as peers. You have been asked to write appraisal report about one of your new colleagues. Write the report for your manager, including the following information: what the colleague is doing well in what areas the colleague should improve how the colleague is getting along with others in the same team
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【简答题】(1) 请写出 HF 的电离方程式 __________________________ (2) 升高温度, HNO 2 的电离平衡常数 ____________ (3) 物质的量浓度相同的上述溶液,[H + ]最小的是 ______ ,溶质分子浓度最小的是 ________ ,最弱的酸是 ________ 。 (4) 25 °C 时,在 1 L 0.1mol·L - 1 的 HA 溶液中,有 ...
【单选题】已知某温度下,几种酸的电离常数如下:K a (HCN)= 6.2×10 -10 mol·L -1 、K a (HF)= 6.8×10 -4 mol·L -1 、K a (CH 3 COOH)= 1.8×10 -5 mol·L -1 、 、K a (HNO 2 )= 6.4×10 -6 mol·L -1 。则物质的量浓度都为0.1 mol·L -1 的下列溶液中,pH最小的是
A.
NaCN
B.
NaF
C.
CH 3 COONa
D.
NaNO 2
【单选题】已知某温度下,以下酸的电离常数如下:K a (HCN)= 6.2×10 -10 mol·L -1 、K a (HF)= 6.8×10 -4 mol·L -1 、K a (CH 3 COOH)= 1.8×10 -5 mol·L -1、 、K a (HNO 2 )= 6.4×10 -6 mol·L -1 。物质的量浓度都为0.1 mol·L -1 的下列溶液中,pH最小的是
A.
HCN
B.
HF
C.
CH 3 COOH
D.
HNO 2
【单选题】常温下,0.1 mol·L-1的HNO2、HCOOH、HCN、H2CO3溶液,它们的电离平衡常数分别为5.6×10-4、1.8×10-4、4.9×10-10、Ka1=4.3×10-7和Ka2=5.6×10-11,其中氢离子浓度最大的是( )
A.
HNO2
B.
HCOOH
C.
HCN
D.
H2CO3
【单选题】常温下,下列各组离子在指定溶液中一定能大量共存的是
A.
使苯酚显紫色的溶液:NH 4 + 、K + 、SCN - 、NO 3 -
B.
0.1mol·L -1 HNO 3 溶液: Na + 、Mg 2+ 、SO 4 2 - 、Cl -
C.
0.5mol·L -1 FeCl 3 溶液:K + 、Na + 、I - 、SO 4 2 -
D.
由水电离产生的c(H + )=10 -13 mol·L -1 的溶液:K + 、Na + 、Cl - 、HCO 3 -
【单选题】设N A 为阿伏加德罗常数的数值,下列说法正确的是
A.
1L0.1mol·L -1 NaHSO 3 溶液中含有H + 的数目为N A 个
B.
常温常压下,等质量的CO 2 和N 2 O的气体体积相等
C.
60g组成为C 2 H 4 O 2 的有机物含C-H键数目为3N A 个
D.
向稀HNO 3 溶液中加入过量的铁粉经充分反应后,转移的电子数目为3N A 个
【判断题】n 阶齐次状态方程的解是 At 的无穷幂级数 。
A.
正确
B.
错误
【判断题】n阶齐次状态方程的解是At的无穷幂级数
A.
正确
B.
错误
【单选题】图样中机件的不可见轮廓线用( )绘制。
A.
粗实线
B.
细点划线
C.
细实线
D.
虚线
【简答题】图样中,机件的可见轮廓线用 绘制,不可见轮廓线用 绘制,尺寸线和尺寸界限用 绘制,对称中心线和轴线用 绘制。 图框线用 绘制。
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