The effect of high vapor superheat in a refrigeration system, is a/an （）. ["increased capacity of the compressor","more efficient operation of the thermal expansion valve","decreased capacity of the compressor","loss of receiver capacity"]
电影电视构图的组成为（）。 ["主体、前景、后景","主体、陪体、环境","主体、陪体","前景、环境、主题"]
During loading or discharging，where the delay is due to the Shipowner’s fault，or that of his servants or agents acting within their authority，the time actually delayed is to be（）in calculating lay days. ["precluded","included","excluded","diluted"]
如果要拍摄远景、全景画面，摄像应采用（）焦距的镜头。 ["长焦距镜头","短焦距镜头","中焦距镜头","以上都不是"]
输送聚合物母液，应选择（） ["螺杆泵","离心泵","齿轮泵","柱塞泵"]
做客礼仪的核心之处在于什么？
