比例尺是地图的一个重要参数，地籍图属于（）图。

下列各题共用备选答案 A．脂质双分子层 B．载体蛋白 C．通道蛋白 D．钠泵 E．钙泵 {TS}骨骼肌兴奋一收缩耦联，肌细胞兴奋时释放到肌质中的Ca2+通过什么机制回收到肌质网终末池

A.脂质双分子层
B.载体蛋白
C.通道蛋白
D.钠泵
E.钙泵

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M：Some credit cards are called gold cards because they offer higher credit limits and lower interest rates.W：But the card holders should pay a significant annual fee，perhaps as high as ￡50.Q：What is the disadvantage for gold cards holders？（）

A．High credit limits
B．High annual fee.
C．Low interest rates.
D．Monthly statements.

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