Jenny is Mr. White's little daughter. She is good at Art . But she isn't good at Math. Mr. White is teaching her ,”What's six plus three?”

    Jenny counts her fingers and answers ,”It's nine .”

    “Good .What's twenty minus three?”

    Anna counts her fingers and toes. “Mm.it's five .No , it's seventeen .”Jenny answers slowly.

    “What's eleven plus twelve, then ?”Jenny looks at her fingers and toes . They are not enough (足够). Seeing this , Mr. White isn't glad and says, “Use your head, Jenny .”

    “That's not enough .I've got only one head.”

根据短文内容，判断下列句子是否正确。

两电阻串联在电路中，已知R₁:R₂=1:4，通过电阻的电流I₁:I₂之比是____ ；电阻两端的电压U₁:U₂之比是____ ；两端的电压与总电压U₁:U总之比是____ 。

下列的描述中，属于气候特征的是

图中①地气候类型为(  )