单项选择题
A.跨距小于或等于60m时,允许偏差为5mmB.跨距大于60m时,允许偏差为L/10000C.跨距小于或等于60m时,允许偏差为6mmD.跨距大于60m时,允许偏差为L/15000
A.跨距小于或等于100m时,允许偏差为4mmB.跨距大于100m时,允许偏差为L/24000C.跨距小于或等于100m时,允许偏差为5mmD.跨距大于100m时,允许偏差为L/20000
A.8%-20%B.20%-80%C.25%-75%D.30%-70%