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【简答题】
某设备维修中心有k名工人，每天到达的需检修的设备服从λ=10的负指数分布，每名工人维修设备的平均时间服从μ=3的负指数分布。现已知设置一名工人的服务成本为每天4元，而设备等待损失为每天25元，试决定此设备维修中心工人的最佳数字k。
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【简答题】How was Bill’s performance in track in the fi rst two years? (Para. 7)
【单选题】By the end of the class, some students______ green food.
A.
have found
B.
will be finding
C.
will have found
D.
are finding
【单选题】The food exports will be ___ by cargo ship.
A.
transplanted
B.
translated
C.
transported
D.
transmitted
【简答题】To lower domestic food prices, some countries limited or stopped their grain exports.
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【单选题】______. In fact, most of our food exports go to the wealthier areas--- Europe, Japan and Canada. We currently ship three times more agricultural exports to Europe than to Latin America and Africa comb...
A.
America’s exports and imports are not balanced.
B.
While America absorbs protein from underdeveloped countries,it doesn’t return it as protein-rich food.
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