皮皮学，免费搜题
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【多选题】
采购的发展体现在A.
采购的复杂性提高
B.
采购的重要性提高
C.
采购管理系统化
D.
采购支出不断降低
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】In an 8 hour day, Andy can produce either 8 loaves or 24 cakes; Rolfe can produce either 24 loaves or 24 cakes. Andy and Rolfe ________.
A.
can gain from exchange if Andy specializes in cake production and Rolfe specializes in bread production
B.
can gain from exchange if Andy specializes in bread production and Rolfe specializes in cake production.
C.
cannot gain from exchange.
D.
can exchange but only Rolfe will gain.
【单选题】关于吗啡镇痛作用机制的描述,正确的是()
A.
降低外周神经末梢对疼痛的感受性
B.
抑制中枢前列腺素的合成
C.
抑制中枢阿片受体
D.
抑制大脑边缘系统
E.
激动中枢阿片受体
【单选题】In an hour, John can produce 20 loaves of bread or 20 cakes while Joe can produce 30 loaves of bread or 15 cakes. The gains from trade will be maximized if John produces _______ and Joe produces _____...
A.
only bread; only cakes
B.
only cakes; only bread
C.
both cakes and bread; only bread
D.
only cakes; both bread and cakes
【单选题】The train _______. Please get ready to get off.
A.
arrives
B.
arrived
C.
is arriving
D.
to arrive
【单选题】关于吗啡镇痛作用机制的描述,正确的是( )
A.
降低外周神经末梢对疼痛的感受性
B.
激动中枢阿片受体
C.
抑制中枢阿片受体
D.
抑制大脑边缘系统
E.
抑制中枢前列腺素的释放
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