The Commonwealth of Nations is an association of independent countries().
A. that were once colonies of Britain
B. that have a large number of British immigrants
C. that have close relations with Britain
D. that have fought on the side of Britain in the two world war
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种蛋孵化时,恒温管理较变温管理更有利于提高孵化效果。
A. 正确
B. 错误
在服装结构缝的处理中,下列属于拼接缝缝制方法的是()。
A. 平缝
B. 卷边缝
C. 拉剥缝
D. 暗包缝
E. 明包缝
固定床离子交换水处理设备,常用的进水装置型式有()等。
决定一个产业中战略集团之间的竞争激烈程度的因素有哪些?