You can just scan the QR code to pay_______________ for your car. A: for the gase B: for the gases C: on the gase D: on the gases

If a crankcase explosion occurs in a diesel engine, you should stop the engine and（） A: immediately open all crankcase relief ports B: increase crankcase exhauster speed to draw cool air into the engine C: allow the engine to cool naturally D: increase crank case scavenge air to remove unburned gase