吗啡禁用于分娩止痛的原因是()
A.促进组胺释放
B.激动蓝斑核的阿片受体
C.抑制呼吸、延长产程
D.抑制去甲肾上腺素神经元活动
E.脑血管扩张,颅内压升高
参考答案:C
-----________did you like his speech ? -
---- Not bad ,but I did’t agree with ______he did .
A.what;that
B.How;everything
C.Why ;what
D.How ; anything
礼仪、纪念型社论{或评论员文章}写作要求是什么?