皮皮学，免费搜题
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【单选题】
要想获得-130 °C的低温条件,应采用( )制冷系统。A.
氨
B.
丙烯
C.
乙烯-丙烯复叠
D.
甲烷-乙烯-丙烯复叠
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】---Mummy, I have borien my train. ---I told you so. You ______on it.
A.
mustn't have fiden
B.
couldn't ride
C.
shouldn't have ridden
D.
needn't ride
【简答题】写出下图二叉树的中序遍历结果( )。
【简答题】（第六章）写出下图二叉树的中序遍历结果（ ）。A. BICDAFHEG
【单选题】—I have to go home now. Daddy and Mummy must be waiting for me.—OK. .A．Take it easy B．Come o
A.
—I have to go home now. Daddy and Mummy must be waiting for me. —OK.____. A．Take it easy
B.
Come on
C.
You’re welcome
D.
See you
【简答题】一个质数有______个因数，一个合数至少有______因数．
【单选题】'Mummy ! Mummy ! I saw some really big tadpoles (蝌蚪) in the pond (池塘). You've promised to catch some for us. 'Phillip says, following me towards the kitchen. 'Some of them have already got legs!' 'Yes...
A.
sharp, nervous, tiresome
B.
anxious, angry, inspiring
C.
soft, sweet, pleasing
D.
eager, excited, demanding
【简答题】预习二叉树的遍历,并写出如下图所示的二叉树的先序、中序、后序遍历序列。请写好后 拍照上传结果
【简答题】质数只有（ ）和（ ）两个因数，合数至少有（ ）个因数。
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