【单选题】【消耗次数：1】
利尿药初期的降压机制可能是
①
降低动脉壁细胞的Na+含量
②
降低血管对缩血管物质的反应性
③
增加血管对扩血管物质的反应性
④
排钠利尿，降低血容量
⑤
以上均是
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缺氧时血管的反应：
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A、冠脉收缩，脑血管收缩，肺血管扩张
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B、冠脉扩张，脑血管收缩，肺血管扩张
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D、冠脉扩张，脑血管、肺血管收缩
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①
It helps people read at a comfortable speed.
②
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③
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④
.It lets people look back over what they have just read