单项选择题
如果在房间的内壁饰以吸声材料或安装吸声结构,或在房间悬挂一些空间吸声体,吸收掉一部分(),则室内的噪声就会降低。A、直达声B、混响声C、宽频声D、低频声
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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
