目前,砌筑工程采用的垂直运输设施有()、()、()和()等。
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塔式起重机的金属结构包括()、动臂和()等。工作机构有起升、()、()和()四部分。电气系统包括电动机、()、()、()、信号及照明装置等。
()通常与前、后顶巴;前、后底巴一起被称为平衡杆五件套。
Which of the following is NOT one of the factors affecting the result of changing childrens behavior?
A. The reinforced practice of the positive opposite.
B. The way parents behave at home.
C. The influences of other relationships of children.
D. The separation of the parents of young children.