單項選擇題

車輛平均技術(shù)等級等于()

A.(一級車數(shù)+二級車數(shù)+三機車數(shù))÷各級車數(shù)總和
B.2(一級車數(shù)+二級車數(shù)+三機車數(shù))÷各級車數(shù)總和
C.(3×一級車數(shù)+2×二級車數(shù)+1×三機車數(shù))÷各級車數(shù)總和
D.(1×一級車數(shù)+2×二級車數(shù)+3×三機車數(shù))÷各級車數(shù)總和

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