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【单选题】
肾上腺素平喘机制主要是:( )A.
抑制过敏物质释放
B.
抑制磷酸二酯酶，使细胞内cAMP增加
C.
激动β2受体，使腺苷酸环化酶活性增强，细胞内cAMP浓度增加
D.
兴奋多巴胺β-羟化酶，使去甲肾上腺素合成增快
E.
直接松弛平滑肌
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举一反三
【单选题】If he should fail, we ___ him to try again.
A.
would encourage
B.
encourage
C.
encouraged
D.
had encouraged
【单选题】本题来自于课本135+158页“虚拟语气”后练习,可在书上做完后再于APP上作答: 5. If he should fail, we him to try again.
A.
would encourage
B.
encourage
C.
encouraged
D.
had encouraged
【单选题】If he should fail to_________the project to a successful close in time, he would be severely_______.
A.
bring; reprimanded
B.
take; criticized
C.
carry; scolded
D.
put; lectured on
【单选题】If he should fail, we him to try again.
A.
would encourage
B.
encourage
C.
encouraged
D.
has encouraged
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