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问题 选择题

在25℃水中加入下列物质，不会使水的电离平衡发生移动的是：

A．KI

B．浓氨水

C．冰醋酸

D．热水

答案

答案：A

A．KI，是强酸强碱盐，没有弱离子，不水解，不会使水的电离平衡发生移动

B 浓氨水是弱碱，会抑制水的电离

C．冰醋酸是弱酸，会抑制水的电离

D 加热，会促进水的电离。

故选A。

单项选择题 共用题干题

男性，40岁。患类风湿性关节炎合并肺间质纤维化，应用激素维持治疗中。近1周来咳嗽，痰稍带脓性，低热。2天前起气急逐渐加重，前来就诊。体检：明显气急、紫绀，两下肺广泛湿啰音。心率110次／分，律齐。动脉血气分析（呼吸空气）示pH7.48，PaCO24.0kPa（30mmHg），PaO26kPa（45mmHg）

机械通气治疗呼吸衰竭，为避免过度通气，应采取下列哪项措施（）。

A.动脉血气分析检测，适当调节参数或加用死腔

B.可允许一定的过度通气

C.加用酸性药物，防止碱血症

D.使用镇静剂，抑制呼吸中枢

E.以上都不是
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单项选择题

Have you ever heard your own voice "Of course," you say.
Has anyone else ever heard your voice Again you say, "Of course. "
But that’ s not quite true. Nobody else has ever heard your voice—the way you hear it. When you talk, you set up sound waves. The air outside your head carries the sound waves to your outer ears. But, of course, the sound of your voice begins inside your head. The bones of your head pick up the sound waves, too. They carry the sound waves straight to your inner ears. You get the sound from the outside and the inside too. Other people get just the sound waves from the outside. That’s why they don’t hear your voice the way you do.

When you talk, other people hear your voice ______.

A．through the bones of your head

B．from the outside

C．from the inside

D．all of the above
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