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问题 单项选择题

已知某喷水室的总喷水量为600kg/h，冷冻水温度为4℃，喷水温度为6℃，回水温度为10℃，则其冷冻水量为（）。

A．300kg/h

B．350kg/h

C．400kg/h

D．450kg/h

答案

参考答案：C

解析：

下图是中国现代史上开天辟地的大事。请你说说与其有关的史实。

（1）请你给这幅图取一个名字；   

                                                                                                                                                            

（2）图中你认识那些人？（至少写2个）   

                                                                                                                                                            

（3）请写出这一事件的重大历史意义。

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             
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单项选择题

苯酐气回收系统由（）作动力。

A.仪表风

B.压缩风

C.氮气

D.蒸汽
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