【判断题】
A、n≤300rpmCm=6.0~7.2m∕s B、300<n≤1000rpmCm=7.0~9.4m∕s C、n>1000rpmCm=9.0~14.2m/s D、n≥1000rpmCm=9.0~14.2m/s
A、n≤300rpmCm=6.0~7.2m∕s B、300<n≤1000rpmCm=7.0~9.4m∕s C、n>1000rpmCm=9.0~14.2m/s D、n≥1000rpmCm=9.0~14.2m/s
A、n≤300rpmCm=6.0~7.2m∕s B、300<n≤1000rpmCm=7.0~9.4m∕s C、n>1000rpmCm=9.0~14.2m/s D、n≥1000rpmCm=9.0~14.2m/s
A、A.n≤300rpmCm=6.0~7.2m∕s B、B.300<n≤1000rpmCm=7.0~9.4m∕s C、C.n>1000rpmCm=9.0~14.2m/s D、D.n≥1000rpmCm=9.0~14.2m/s