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【单选题】
What were people doing in China and the Middle East as far back as 5000 BC?A.
They were exchanging metals for goods.
B.
They were exchanging one item for another.
C.
They were using salts to purchase goods.
D.
They were using coins as money.
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【单选题】使用燃料气的加热炉，其工艺流程是燃料气在加热炉中燃烧，使被加热物料加热到一定的出口温度，控制的主要目标是使被加热物料的出口温度保持恒定，同时还要防止阀后压力超限，设计一个出口温度与阀后压力的选择性控制系统可以满足上述控制要求。问：当出口温度控制器和阀后压力控制器均为反作用控制器时，选择器应为（）
A.
低选器
B.
高选器
C.
两者均可
【单选题】Climbing is one of _____, I think. [ ]
A.
the most difficult sport
B.
the most difficult sports
C.
most difficult sport
D.
most difficult sports
【单选题】In which type of organization is team building likely to be most difficult?
A.
. Functional
B.
. Projectized
C.
. Matrixed
D.
. Project expediter
E.
. Project coordinator
【单选题】Lesson Three is Athe most difficult lesson, Bbut it isnt Cthe most difficult lesson Din Book Four.
A.
B.
C.
D.
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