某铅笔厂原来只生产铅笔，现在又增加圆珠笔的生产，这属于（）。 ["同心多元化","离心多元化","混合多元化","一体化"]
Which of the following factors will have the greatest effect on the heating load within a conditioned space?（） ["Solar gain","Infiltration and ventilation air","Occupants inside the space","Entertainment equipment within the space"]
NO1信令中KD信号代表发端呼叫业务类别，KD＝3表示（）。 ["长途自动呼叫","市内电话呼叫","测试呼叫","优先用户呼叫"]
《长城万里图》标志着周而复超越了《上海的早晨》所体现的阶级模式而较为强烈地表现民族意识。
All the holds which are to take cereals in bags must be so cleaned that they meet the requirements of the（）. ["local agent","cargo surveyor","accident investigator","general average adjuster"]
水泵―水箱联合给水方式用在什么样的建筑中？
