To obtain a satisfactory result , one must apply two() of paint on a clean surface.
A
暂无解析
Theopeningceremonyisagreatoccasion.Itisessential_____forthat.
Itwasrecommendedthatpassengers_____smokeduringtheflight.
At______,photographyisachemicalprocess,duringwhichalight-sensitivematerialisalteredwhenexposedtolight.