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【单选题】
微分方程 的阶数是A.
1
B.
3
C.
2
D.
0
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皮皮学刷刷变学霸
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A.
exciting
B.
comfortable
C.
tiring
D.
boring
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believable
B.
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C.
full of misinformation
D.
helpful to consumers
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A.
exciting
B.
endurable
C.
tiring
D.
boring
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