皮皮学，免费搜题
登录
搜题
【单选题】
下列哪一生理或病理过程属于正反馈A.
体位由卧位转变为直立时，通过压力感受性反射使血压回升
B.
激素水平降低时，相应受体的亲和力以及在膜上表达的数量均增加
C.
大失血使血压降低，心脏血供不足，心输出量减少而进一步降低血压
D.
反应中，血中ACTH和肾上腺糖皮质激素水平持续升高
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】The two products _____ the same category.
A.
fall off
B.
fall down
C.
fall into
D.
fall over
【简答题】A．fall down B．fall into C．fall across
【单选题】His hair was beginning to ________ in handfuls.
A.
fall down
B.
fall out
C.
fall apart
D.
fall back
【单选题】The phrase 'signs off on' in the last paragraph is closest in meaning to ______.
A.
signs a contract to build
B.
accepts the idea of
C.
agrees to buy
D.
has got used to
【单选题】Let's not ______ over such a trifle!
A.
fall through
B.
fall off
C.
fall out
D.
fall back
【单选题】Let' s not_____over such a trifle!
A.
fall out
B.
fall through
C.
fall to
D.
fall behind
【单选题】In autumn, leaves turn yellow and _________ the trees.
A.
fall out
B.
fall off
C.
fall down
D.
fall over
相关题目：
参考解析：
知识点：
题目纠错 0
发布
