下列人工气腹对呼吸系统的影响中，哪一项是正确的（）。 A.肺泡无效腔量增大 B.功能

阅读理解。

      Hello!  My name is Gina. I have two brothers.  They are Dave and Alan.  Dave likes sports

very much. He likes to play volleyball. He plays volleyball every afternoon. He has five volleyballs.

Alan doesn't like sports. He likes to watch TV. He watches TV every evening.

1.Is Gina Dave's sister?

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2.Does Dave play volleyball every afternoon?

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3.How many volleyballs does Dave have?

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4.Who likes to watch TV, Gina, Dave or Alan?

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5.How many brothers does Gina have?

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列举元朝时形成的新民族——回族是由哪些外国人和中国哪些民族长期杂居相处，互通婚姻，逐渐融合而形成的。

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下列关于血钙的叙述，下列哪一项是正确的（）。

A.非扩散钙包括柠檬酸钙

B.可扩散钙即为游离钙

C.非扩散钙即为结合钙

D.结合钙均不能透过毛细血管壁

E.以上都错误

1µs等于（）。

A、10s

B、10-6s

C、10-9s

D、10-3s

药物干燥失重测定法的方法不包括（）

A.干燥剂干燥法

B.吸附指示剂法

C.热重法

D.减压干燥法

E.常压恒温干燥法