混凝土振捣采用插入式振动器的振捣顺序宜从近模板处开始，先外后内，移动间距不应大于振动器有效半径的（）倍。
A.1
B.1.5
C.2
D.3
参考答案：B
我国人民民主专政的特点是( )。
A．民主与专政的统一
B．中 * * 党的领导
C．存在着一个广泛的爱国统一战线
D．知识分子是工人阶级的一部分
—____busy schoolwork,the children also have to take arts,music and sports
classes in their free time.
—I wonder what they will become.
A．Rather than
B．Owing to
C．Except for
D．Apart from
