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【多选题】
本次实验中开普勒望远镜的放大率理论值与两透镜的焦距有关,等于 比上 。A.
物镜像方焦距，目镜物方焦距
B.
目镜物方焦距，物镜像方焦距
C.
物镜的像方焦距，目镜的像方焦距负值
D.
物镜的像方焦距，目镜的像方焦距
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反馈参考答案：
举一反三
【简答题】室内消火栓灭火系统是由( )、( )、( )和( )等组成。
【简答题】建筑的室内消火栓给水系统是由一个生活、生产和消防共用水源的环网供水的消火栓灭火系统。
【单选题】_________the heavy rain, we stayed at home.
A.
But for
B.
Due to
C.
Owing to
D.
As to
【简答题】She stayed at home for a week to look after her ill child.
【单选题】——Why did he stay at home?——It was only _______ it was raining _______ he stayed at home.A．since
A.
27. ——Why did he stay at home? ——It was only _______ it was raining _______ he stayed at home. A．since; so
B.
because; that
C.
for; that
D.
as; what
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