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研究物质通常从组成、结构、性质、用途等方面来进行。以石墨为例： 从结构上：石墨由碳原子按层状排列； 从组成上：_______________________； 从性质上：_______________________； 从用途上：_______________________。
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【单选题】进口许可证制度是一种管制进出口贸易的手段，就其职能和实施范围来说( )
A.
它只能限制进出口商品的数量
B.
它只能限制进出口商品的质量
C.
它既能限制进出口商品的数量、又能限制进出口商品的质量
D.
它既能限制进出口商品的数量、又能限制价格、市场等方面
【单选题】根据下列文章,请回答 46～50 题。 Female Bullfighting It was a unique，eye-catching sight：an attractive woman in a shiny bullfighter’s suit， sword in hand，facing the sharp horns of a black，500-kilogram beast． Most p...
A.
She intends to become even better than Sanchez was．
B.
Her father was an aspiring(有雄心壮志的)bullfighter
C.
But many bullfighting professionals continue to insist that women do not have what it takes to perform. the country’s” national show”．
D.
“I’m a woman from head to toe and proud of it．”she once said．
E.
She looks like a male bullfighter．
F.
But recently,29-year-old Mad Paz Vega became the second woman in Spanish history to fight against those heavy animals． 第 46 题 请选择（1）处最佳答案。
【单选题】Female Bullfighting It was a unique, eye-catching sight: an attractive woman in a shiny bullfighter's suit, sword in hand, facing the sharp horns of a black, 500-kilogram beast. Most people thought th...
A.
She intends to become even better than Sanchez was.
B.
Her father was an aspiring (有雄心壮志的) bullfighter.
C.
But many bullfighting professionals continue to insist that women do not have what it takes to perform. the country's 'national show'.
D.
'I'm a woman from head to toe and proud of it,' she once said.
E.
She looks like a male bullfighter.
F.
But recently, 29-year-old Marl Paz Vega became the second woman in Spanish history to fight against those heavy animals. 第 46 题 请选择（46）处的最佳答案．
【单选题】进出口许可证制度是一种管制进出口贸易的手段，就其作用来说，不包括 ( )
A.
它可以限制进出口商品的数量
B.
它可以控制进出口商品的质量
C.
它可以限制进出口商品的技术
D.
它可以限制进出口商品的方式
【单选题】进出口许可证制度是一种管制进出口贸易的手段，就其职能和实施范围来说（ ）。
A.
它只能限制进出口商品的数量。
B.
它只能限制进出口商品的质量。
C.
它既能限制进出口商品的数量、又能限制进出口商品的质量。
D.
它既能限制进出口商品的数量、又能限制价格、市场等方面。
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