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【单选题】
《危险化学品重大危险源辨识》GB18218—2009中将“危险化学品重大危险源”定义为长期地或临时地生产、加工、使用或储存危险化学品，且危险化学品的（）临界量的单元。A.
种类等于
B.
数量等于或超过
C.
种类等于或超过
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【单选题】听力原文： It may seem strange to date the emergence of a global economy in 1973, since that was the year of the first oil shock. The price of a barrel of oil was raised dramatically, leading to a slump in...
A.
The drop in economies of industrialized nations caused by the rise of oil price.
B.
The cease of the United States' dominant position in the world economy.
C.
The competition from Western Europe and Japan to the U. S. in international trade.
D.
All of the above.
【单选题】____ seems strange to us is ______ she can sing so many English songs beautifully.
A.
It; that
B.
That; how
C.
It; Why
D.
What; that
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