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【单选题】
加法原则的数学思想A.
分类讨论
B.
等价替换
C.
演绎
D.
分步骤
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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【简答题】编辑网格-分离;网格-填充洞;变形-晶格
【简答题】Americans can travel almost anywhere they choose. But to protect (保护) its people, the government lists a few erous places where Americans cannot go. These places are unfriendly countries or countr...
【单选题】Travelers can choose a train, a bus, a ship, a plane, etc. as their means of transportation _____ their tastes.
A.
according to
B.
in according with
C.
in regard to
D.
judge from
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