已知⊙O1与⊙O2是等圆，相交于A、B两点，若∠AO1B=60°，O1A=1cm

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问题填空题

已知⊙O₁与⊙O₂是等圆，相交于A、B两点，若∠AO₁B=60°，O₁A=1cm，则O₁O₂的长是（）。

答案

选择题

So desperate ________ that no one could help another, each ________ to save himself and his animals.[ ]

A. was the situation; was trying

B. the situation was; trying

C. the situation was; was trying

D. was the situation; trying

单项选择题

在放线菌发育过程中，吸收水分和营养的器官为（）

A、基质菌丝

B、气生菌丝

C、孢子丝

D、孢子