【单选题】 A Anairblastspreadsaliquidrainrepellantevenlyoverthewindshieldthatpreventsraindropsfromclingingtotheglasssurface. B Anairblastformsabarrierthatpreventsraindropsfromstrikingthewindshieldsurface. C Apneumaticrainremovalsystemissimplyamechanicalwindshieldwipersystemthatispoweredbypneumaticsystempressure.
