Question:B2 and C1 in which the specific distinction?
Answer:quasi-driving type and code
codequasi-driving type of vehicle drivingquasi-allowed to drive other potential drivers of large passenger
typeA1large passenger carA3, B1, B2, C1, C2, C3, C4, M
tractorA2heavy, medium-wide linked to, tractor-semitrailerB1, B2, C1, C2, C3, C4, M
Bus nuclearA3contains more than 10 city busC1, C2, C3, C4
medium-sized medium-sized passenger carsB1passenger [...]