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【简答题】
已知正常数a，b和正变数x，y满足a+b=10， ，x+y的最小值为18，求a，b的值。
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举一反三
【单选题】Actually, over 60 percents of the world s 580 million older people live in developing countries. An increasing number of people in these lands are reaching old age【C1】______better health care and impr...
A.
as usual as
B.
as a result of
C.
as a rule for
D.
as a matter of
【单选题】According to the passage, what truely results in the impoverishment of the developing countries?
A.
The rapid growth of population.
B.
The presenvation of rainforests.
C.
The cutting of rainforests.
D.
The conflicts between developed countries and developing countries.
【简答题】中控操作员的职责包含 ____、____、___。
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