电加热器前后800mm范围内的风管绝热层应采用( )材料。
A.不燃烧 B.可燃烧C.难燃 D.易燃
参考答案:A
---Have you called Mr Johnson’s office?
---Yes.He ____back before tomorrow noon.So he can attend our meeting on time.
A.expected
B.is expected
C.is expecting
D.is to expect
短效口服避孕药的恰当用法是哪项()
A.月经周期第5天开始,隔日服2片,连服22天
B.月经来潮当天服1片,连服22天
C.月经周期第5天开始,每天1片,连服30天
D.月经周期第5天开始,每天1片,连服22天
E.同房后即服1片,次日加服1片