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【单选题】
急性胰腺炎时，关于淀粉酶的改变下列哪错误的()A.
尿淀粉酶增高血清淀粉酶
B.
尿淀粉酶下降较血清淀粉酶晚
C.
尿淀粉酶测定值如大于128单位有诊断意义
D.
坏死性胰腺炎，尿淀粉酶不一定增高
E.
尿淀粉酶高低与病情轻重不一定成正比
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【单选题】设向量 a , b , c 为三个任意向量，则（ a + b )× c = ( )
A.
a × c + c × b
B.
a × c + b × c
C.
c × a + c × b
D.
c × a + b × c
【单选题】Natural flavorings and fragrances are often costly and limited in supply. For example, the vital ingredient in a rose fragrance is extracted from natural rose oil at a cost of thousands of dollars a p...
A.
natural flavorings and fragrances are not quite dear
B.
the limitation of natural flavorings and fragrances is clear
C.
the supply of natural flavorings and fragrances is adequate to meet the demand
D.
the cost of producing natural flavorings and fragrances is high
【判断题】The basic factors of production in an economy include labor, capital, and natural resources.()
A.
正确
B.
错误
【单选题】Natural flavorings and fragrances are often costly and limited in supply. For example, the vital ingredient in a rose fragrance is extracted from natural rose oil at a cost of thousands of dollars a p...
A.
natural flavorings and fragrances are not quite dear
B.
the limitation of natural flavorings and fragrances is clear
C.
the supply of natural flavorings and fragrances is adequate to meet the demand
D.
the cost of producing natural flavorings and fragrances is high
【判断题】This was the last place the explorers would leave, for it lay riches and natural resources. 这是那些探险家最后离开的地方，因为那里蕴藏着财富和自然资源。()
A.
正确
B.
错误
【简答题】The Natural Approach suggests that grammar use should be limited to situations where it will not ______with communication.
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