單項選擇題

對于一只性能良好的點火線圈,當(dāng)斷電器凸輪轉(zhuǎn)速為1000r時,三針放電器上電火花跳動了9mm的間隙。而當(dāng)凸輪升到1500r時,電火花能跳過的間隙應(yīng)當(dāng)是()

A.7mm
B.9mm
C.12mm
D.15mm

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