图示的电路中，电阻R1和R2串连接在AB两端，电压表并连接在R1两端

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问题填空题

图示的电路中，电阻R₁和R₂串连接在AB两端，电压表并连接在R₁两端．已知R₁=10Ω，R₂=20Ω，电压表示数为2.5V，则AB两端的电压U=___________V．

答案

7.5

选择题

There were about six _______ students in the school building during the earthquake,

and _______ of them didn't run out. [ ]

A. hundred, two third

B. hundred, two thirds

C. hundreds, two thirds

D. hundreds, two third

判断题

我国实行一级政府一级预算。