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【单选题】
下列对实验现象及操作的解释合理的是（ ） 操作及现象 解释 A KI淀粉溶液中滴入氯水变蓝，再通入SO 2 ，褪色 SO 2 具有漂白性 B 配制FeCl 3 溶液时需加入少量盐酸 盐酸能抑制Fe 3+ 的水解 C 某钠盐溶液中加入盐酸酸化的硝酸钡溶液有白色沉淀 说明该钠盐是硫酸钠或硫酸氢钠 D 向含有少量的FeBr 2 的FeCl 2 溶液中，加入适量氯水，再加CCl 4 萃取分液 除去FeCl 2 溶液中的FeBr 2A.
A
B.
B
C.
C
D.
D
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举一反三
【单选题】_____ being prepared for the flight, the crew also ensure that all passengers know safety matters.
A.
Beside
B.
Not only
C.
As well as
D.
In addition
【单选题】The writer of this passage refers to the history of money in order to ______.
A.
show that silver and gold are previous metals
B.
show that one should convert paper money to gold
C.
explain the nature of money
D.
show that anything can serve as money in modern times
【单选题】我国信息安全面临的威胁有( ) 1主要技术依赖进口,信息产业受制于人 2信息安全的防护能力较弱 3信息安全管理机构尚不完善 4信息安全意识亟待提高 5信息传播速度急剧加快
A.
①②③④⑤
B.
①②③④
C.
①②③⑤
D.
②③④⑤
【单选题】Pilots train on flight simulators for safety, learning efficiency, and cost savings. This is an example of ________.
A.
apprenticeship training
B.
on-the-job training
C.
vestibule training ( 技工培训 )
D.
programmed learning
【单选题】The reservation agent a window seat for him on the flight.
A.
book
B.
reserving
C.
assigned
D.
safety
【单选题】The writer of this passage refers to the history of money in order to ______________.
A.
show that silver and gold are previous metals
B.
show that one should convert paper money to gold
C.
explain the nature of money
D.
show that anything can serve as money in modem times
【简答题】信息安全面临的主要威胁有哪些?
【简答题】信息安全面临的主要威胁有哪些?
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