皮皮学，免费搜题
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【单选题】
请多学们凭自己的经验猜测一下试验结果:A.
照明条件减弱的组产量下降
B.
两组产量没有明显变化
C.
两组的产量都上升了
D.
两组的产量都下降了
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
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