支持和控制生产运作系统运行的要素主要包括（）。 A.人员组织 B.生产计划 C.生产

根据短文内容及首字母提示, 填写所缺的单词。

     There was a big earthquake under the India Ocean Area o  1  December 26th 2004 and it c  2   a

large tsunami. Tsunamis are great sea waves produced especially by an earthquake.

     That morning my classmates and I went to the seaside and had breakfast when we h  3  a loud noise

like bombs. People in the sea ran w   4   to the bank and s   5   , 'Water is coming!' Someone told us to

run to a higher place. We ran as q  6   as we could.

     Since we did not know what happened,  we  were very f   7    . We looked back  and  saw  a t   8    

picture. The water waves were so strong that cars  were made to fall upside down and the flood w  9  

away everything on the seaside .

     We were safe but the n   10   of victims was over 140,000. People call the day 'Black Sunday'.

依据现行《建筑设计防火规范》的规定，防烟楼梯间的前室或合用前室的加压送风口应（）

A.每层设置1个

B.每隔1层设置1个

C.每隔2层设置1个

D.每隔3层设置1个

当黄赤交角等于零时

A．同一经线各地日出日落时刻相同

B．地球上无昼夜更替现象

C．一天中太阳高度角不变

D．地球上水平运动的物体不发生偏转

通过2mm筛较多的粗粒料，具体用何种方法进行筛分？并说明原因。

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