{图A.2/3*SIN(31415926/4) B.20*SIN(π/1)/60 C.2*SIN(31415926/4)/3 D.20/3*SIN(PI/40)

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问题 {图

选项 A.2/3*SIN(31415926/4)
B.20*SIN(π/1)/60
C.2*SIN(31415926/4)/3
D.20/3*SIN(PI/40)

答案C

解析
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