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【多选题】
通常用以解释区域贸易活动形成原因的主要理论观点有()A.
绝对成本学说:地区差异引起区域贸易
B.
相互需求法则:相互需求产生贸易
C.
生产要素禀赋学说:生产要素禀赋决定区域贸易格局
D.
比较利益学说:比较利益决定贸易
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【单选题】When I was walking in the street, I met a friend of_____. [ ]
A.
my mother
B.
my mother’s
C.
mine mother’s
D.
mine mother
【简答题】I am my mother’s third child. When I was born, her doctor gently explained to my mother that my left arm was 41 , below the elbow (肘部). Then he gave her some 42 . “Don’t treat her any 43 from the othe...
【多选题】下列关于絮凝剂与反絮凝剂的正确表述为
A.
在混悬剂中加入适量电解质可使ξ电位适当降低，称电解质为反絮凝剂
B.
ξ电位在20～25mV时混悬剂恰好产生絮凝
C.
同一电解质因用量不同，在混悬剂中可以起絮凝作用或起反絮凝作用
D.
絮凝剂离子的化合价与浓度对混悬剂的絮凝无影响
E.
枸橼酸盐、酒石酸盐可作絮凝剂使用
【简答题】I am my mother’s third child. When I was born, the doctor gently explained to my mother that my left arm was missing, below the elbow(肘). Then he gave her some _________, “Don’t treat her any ________...
【单选题】盖板梳棉机上轻重牙齿数与生条定量之间的关系是()。
A.
轻重牙齿数增加，则生条定量减小
B.
轻重牙齿数增加，则生条定量增加
C.
轻重牙齿数减少，则生条定量增加
D.
上面三种关系都不对
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