单项选择题 汽车钣金件主要使用（      ）进行制造。 A、冲压模具 B、塑料模具 C、铸造模具 D、锻造模具

单项选择题 Which is talking about the contribution of research at the tactical and program-specific level?A.Research helps set organizational goals and policies.B.Research provides guidance with the short-term and specific marketing and operational decisions.C.Research assists the CVB staff in effectively managing their limited time and resources.D.Research helps formulate a destination’s tourism master plan.

判断题 气缸是不运动的，故气缸壁不需要润滑。正确错误