| In the two decades between 1910 and
1930, over ten percent to the Black population of the United States left the
South, where the preponderance of the Black population had been located, and
migrated to northern states, with the largest number moving, it is claimed,
between 1916 and 1918. It has been frequently assumed, but not proved, that the
majority of the migrants in what has come to be called the Great Migration came
from rural areas and were motivated by two concurrent factors: the collapse
of the cotton industry following the boll weevil infestation, which began
in 1898, and increased demand in the North for labor following the cessation of
European immigration caused by the outbreak of the First World War in
1914. This assumption has led to the conclusion that the migrants’ subsequent
lack of economic mobility in the North is tie A. The reasons for the subsequent economic difficulties of those who participated in the Great Migration. B. The effect of migration on the regional economies of the United States following the First World War. C. The transition from a rural to an urban existence for those who migrated in the Great Migration. D. The disappearance of the artisan class in the United States as a consequence of mechanization in the early twentieth century. [单选题]4.191.
电表时钟严重超差指的是电表时钟与主站时钟偏差超过()分钟。 A.15 B.30 C.5 D.10 [单项选择]
With the spread of inter-active electronic media a man alone in his own home will never have been so well placed to fill the inexplicable mental space between cradle and crematorium. So I suspect that books will be pushed more and more into those moments of travel or difficult defecation (1) people still don’t quite know what to do with. [多选题]关于税务行政许可实施程序听证规定的说法，正确的有（ ）。
A.税务行政机关一般可视具体情况自由裁量决定是否公开举行听证 B.组织听证的税务行政机关应当根据听证笔录作出行政许可决定 C.申请人、利害关系人可以依照规定提出听证主持人回避的申请 D.税务行政机关必须在举行听证5日前将时间、地点通知申请人、利害关系人 E.税务行政机关举行听证应当制作听证笔录，笔录应当交听证参与人确认无误后签字或者盖章 [单选题]严重冲击地压厚煤层中双巷掘进时，两条平行巷道之间的煤柱不得小于（）m。
A.5 B.8 C.10 [单选题]由CNC铣床操作者执行选择性程序停止的指令是()。
A.M00 B.M01 C.M03 D.M04。 [单项选择]可同时承受较大径向力和轴向力，应选（）。
A. 向心轴承 B. 推力轴承 C. 向心推力轴承 D. 一般轴承 [单选题] 受热面酸洗后进行钝化处理的目的是( )。
A.在金属表面形成一层较密的磁性氧化铁保护膜 。 B.使金属表面光滑 C.在金属表面生成一层防磨保护层 。 D.冲洗干净金属表面的残余铁屑。 [单项选择]速度快、印字质量好、噪音低的打印机类型是（）。
A. 喷墨式打印机 B. 激光式打印机 C. 击打式打印机 D. 点阵式打印机 [多选题]为保证拆除爆破炮孔填塞质量，最好采用以下哪些材料混合配制炮泥？( )
A.砂 B.黏土 C.石灰 D.水 我来回答: 提交
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