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【单选题】
下列关于臭氧的说法，不正确的是( )。A.
大气O 3 的测定方法有分光光度法、化学发光法、紫外光度法等
B.
我国测定O 3 的标准方法为靛蓝二磺酸钠分光光度法和硼酸碘化钾分光光度法
C.
靛蓝二磺酸钠分光光度法中，空气中的臭氧在磷酸盐缓冲剂存在下，与吸收液中蓝色的靛蓝二磺酸钠反应，褪色生成靛红二磺酸钠，在610nm处测量吸光度
D.
靛蓝二磺酸钠分光光度法测定臭氧时，若空气中氯气、二氧化氯的存在使臭氧的测定结果偏高
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举一反三
【单选题】When he heard how well the new company was doing, he took a calculated ______ and invested all his money in it.
A.
risk
B.
opportunity
C.
danger
D.
venture
【简答题】The work of the sales team was absolutely ________ to the success of the new toy company.
【简答题】The new company was c___________ with (面临) many difficulties.
【简答题】The first thing the new chairman of the company did was to ___________ the management.
【单选题】After the partnership deal had been agreed upon, the shipping company was able to
A.
employ more staff.
B.
reduce its costs.
C.
explore new oil fields.
【单选题】The company held back the first shipment of the new product until it was completely ready.
A.
to stop yourself from doing something
B.
to keep
C.
to delay
【单选题】The new accountant was extremely ______ at his job and improved the financial profile of the company.
A.
competent
B.
adequate
C.
satisfactory
【单选题】The company _____ that its new camera was the best one on the market.
A.
designed
B.
claimed
C.
ignored
D.
reversed
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