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【简答题】
Complete the following sentences with appropriate phrases from the box. Change the form if necessary. assist perform phase adapt specific trait superior make employ reward 1) The project is only in the initial _________, but it ’ s looking quite promising. 2) The experiment will be ___________ in a controlled environment. 3) More people are now ___________ in service industries than in manufacturing. 4) He ’ s a competent enough officer, but I doubt he ’ ll ever _________ a general. 5) His sense of humor is one of his better _________. 6) Manufacturing companies spend millions of pounds trying to convince customers that their products are ____________ to those of other companies. 7) Many software companies have __________ popular programs to the new operating system. 8) He asked us to ____________ him in carrying through their plan. 9) You said you live in the West Country, would you be more ____________? 10) He was ___________ for his years of service to the company with a grand farewell party and several presents.
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【单选题】他和卫青在漠北战役中打败匈奴,汉武帝为他修建了一座豪华的府第,他却以“匈奴未灭,何以家为?”为由拒绝收下,这短短的八个字,因为出自他之口而震撼人心,永远刻在了历朝历代保家卫国将士们的心里,这里的“他”是指( )
A.
蒙恬
B.
主父偃
C.
霍去病
D.
窦固
【单选题】扫描时间因数为10ns/div,被测方波脉冲在水平轴上显示一个完整周期为5div,则该方波重复频率是( )
A.
20MHZ
B.
50MHZ
C.
20KHZ
D.
50KHZ
【简答题】State some facts about the North Region of Canada.
【简答题】在50cm 3 0.020mol·dm -3 Ca 2+ 离子溶液中,加入25cm 3 0.040mol·dm -3 的EDTA溶液,并稀释至100cm 3 ,假设溶液的pH=12,计算溶液中Ca 2+ 离子的平衡浓度。
【简答题】1取50.0cm 3 0.100mol·dm -3 某一元弱酸溶液,与20.0cm 3 、0.100mol·dm -3 KOH溶液混合,将混合溶液稀释至100cm 3 ,测得此溶液的pH值为5.25。求此一元弱酸的解离常数。
【单选题】Some journalist had written a(n) ______ about him in which some of the facts were untrue.
A.
outlook
B.
profile
C.
appearance
D.
performance
【简答题】在量热计(如下图所示)中将l00cm 3 、0. 500mol·L -1 CH 3 COOH溶液与100cm 3 、0. 500mol·L -1 NaOH溶液混合,温度从298.16K升高到300. 71K。已知量热计的热容常数(量热计各部件每升高1K所需的热量)是150. 5J·K -1 ,CH 3 COONa溶液比热容为4.03J·g -1 ·K -1 ,溶液的密度为0. 963g·cm -3...
【简答题】结晶紫萃取光度法萃取Au,100cm 3 试液含Au100μg,取其20cm 3 试液用5cm 3 CHCl 3 萃取,萃取率E%=100%,用1cm比色皿,在λ max =600nm下测得T%=50%,试计算A,a,ε,S。(M(Au)=197.0)。
【单选题】关于0.2 mol/L的NaOH溶液,下列说法不正确的是(  )。
A.
100 mL该溶液中含0.8 g NaOH
B.
200 mL该溶液与100 mL 0.2 mol/L的硫酸溶液反应形成中性溶液
C.
100 mL该溶液中约含0.02 mol×6.02×10 23 mol - 1 个Na +
D.
配制含1 L水的该溶液,需NaOH的质量为8 g
【简答题】取50.0cm 3 0.100mol·dm -3 某一元弱酸溶液,与20.0cm 3 、0.100mol·dm -3 KOH溶液混合,将混合溶液稀释至100cm 3 ,测得此溶液的pH值为5.25。求此一元弱酸的解离常数。
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