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【单选题】
优良的环境是人类生存和科学发展的基本条件,下列连线前后关系正确的是 ①温室效应--二氧化碳 ②酸雨--二氧化硫 ③臭氧层空洞--氧气 ④不使用含磷洗衣粉--减少水质污染 ⑤使用无铅汽油--减少空气污染 [     ]
A.
①②③④
B.
②③④⑤
C.
①②③④⑤
D.
①②④⑤
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举一反三
【单选题】在NH3.H2O溶液中,加入少量NH4Cl溶液,溶液的pH值将 ( )。
A.
升高
B.
降低
C.
不变
D.
不能判断
【单选题】下列离子方程式书写正确的是(  )
A.
在Fe(OH) 3 中加入HI溶液:Fe(OH) 3 +3H + ═Fe 3+ +3H 2 O
B.
在稀氨水中通入少量CO 2 :NH 3 ?H 2 O+CO 2 ═NH 4 + +HCO 3 -
C.
向澄清石灰水中加入足量NaHCO 3 溶液:Ca 2+ +OH - +HCO 3 - ═CaCO 3 ↓+H 2 O
D.
在酸性KMnO 4 溶液中加入H 2 O 2 :2MnO 4 - +5H 2 O 2 +6H + ═2Mn 2+ +5O 2 ↑+8H 2 O
【简答题】Make a dialogue: How does a cabin attendant make a self-introduction to the passengers?
【简答题】A.用氨水吸收少量SO 2 气体:2NH 3 ·H 2 O+SO 2 =2NH 4 + +SO 3 2- +H 2 O B.NaHSO 4 溶液中滴入Ba(OH) 2 溶液至中性:H + +SO 4 2- +Ba 2+ 十OH - ===BaSO 4 ↓+H 2 O C.在H 2 O 2 中加入酸性KMnO 4 溶液:2MnO 4 - +5H 2 O 2 +6H + ====2Mn 2+ +5O ...
【多选题】The following scenario relates to questions 82 - 86 Your audit firm Cal & Co has just gained a new audit client, Tirrol Co, in a tender in which Cal & Co offered competitively low audit fees. You are ...
A.
We should budget for the extra time required to document an understanding of the entity, its environment and its systems, and to verify material opening balances.
B.
Given the tight reporting deadline, a combined approach should be adopted on the audit, relying on tests of controls wherever possible.
C.
We must agree a clear timetable with the client for the testing of the computerized inventory systems, setting out availability of access to the system, files and personnel required to complete testing.
D.
As this is our first year of audit, we should agree separate fees with the client for any additional audit procedures required. If the client refuses, we should consider withdrawing from the audit as Cal & Co would be deemed to be lowballing.
【单选题】下列离子方程式正确的是 [     ]
A.
向NH 4 HSO 4 溶液中滴加少量的Ba(OH) 2 溶液:Ba 2+ +2OH - +NH 4 + +H + == BaSO 4 ↓+NH 3 ·H 2 O+H 2 O
B.
向漂白粉溶液中通入过量的SO 2 气体:ClO - +SO 2 +H 2 O== HSO 3 - +HClO
C.
向偏铝酸钠溶液中通入少量CO 2 气体:AlO 2 - +CO 2 +2H 2 O== Al(OH) 3 ↓+HCO 3 -
D.
海水中的Fe 2+ 在铁细菌的催化下被氧化成Fe 2 O 3 :4Fe 2+ +8OH - +CO 2 ==2Fe 2 O 3 +HCHO+3H 2 O
【单选题】事业单位从财政国库取得的预算资金属于 ( )。
A.
事业收入
B.
财政补助收入
C.
上级补助收入
D.
财政专户返还收入
【单选题】常温下,对下列各溶液的叙述不正确的是(  )
A.
CH 3 COONa溶液中:c(OH - )=c(H + )+c(CH 3 COOH)
B.
在pH=8的NaF溶液中,c(Na + )-c(F - )=9.9×10 -7 mol/L
C.
pH=2的盐酸与pH=12的Ba(OH) 2 溶液等体积混合后,溶液中一定有c(H + )=c(OH - )
D.
向0.1mol/L氨水中加入少量NH 4 Cl固体,溶液中c(OH - )/c(NH 3 ?H 2 O)增大
【单选题】下列离子方程式书写正确的是
A.
在Fe(OH) 3 胶体中加入HI溶液:Fe(OH) 3 + 3H += Fe 3+ + 3H 2 O
B.
在稀氨水中通入少量SO 2 :NH 3 ?H 2 O+SO 2= NH 4 + +HSO 3 -
C.
向澄清石灰水中加入足量NaHCO 3 溶液: Ca 2+ + OH - +HCO 3 -= CaCO 3 ↓+ H 2 O
D.
在酸性KMnO 4 溶液中加入H 2 O 2 : 2MnO 4 - +5H 2 O 2 + 6H + =2Mn 2+ +5O 2 ↑+ 8H 2 O
【单选题】As well as providing some much-needed stress relief, play can end up being, counterintuitively, very productive. We can make interesting, new connections between ideas when we allow ourselves to loose...
A.
play may lower productivity
B.
play may allows us to take a rest
C.
play may be negative for stress relief
D.
play may encourage long hours
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