A.不应大于500mm和不应超过1m B.不应小于500mm和不应小于1m C.不应小于500mm和不应超过1m D.不应大于500mm和不应小于1m
A.10℃;15℃;20℃ B.5℃;10℃;15℃ C.15℃;20℃;25℃
A.3d B.7d C.15d D.28d