皮皮学，免费搜题
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【单选题】
给蔬菜大棚使用“气肥”,可提高作物产量,“气肥”是指( )A.
氮气
B.
氧气
C.
氢气
D.
二氧化碳
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
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【简答题】Norman和Borow(1975) 遵循能量或资源分配的观点提出了 和 两类过程 。
【简答题】设 ,讨论当 时的极限情况。
【简答题】A．He should press and try the buttons one by one. B．He should ask the salesgirl to show him how to operate it. C．He should read the user's operation manual first. D．He should try to remember what the ...
【单选题】听力原文：W: The red coat is ＄45 and the black one is ＄35. Which one do you want? M: Neither. I want that large yellow one. How much is it? W: It's twice as much as the black one. How much is the yellow co...
A.
＄20.
B.
＄45.
C.
＄70.
D.
$90.00
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