三相配电干线的各相负荷宜平衡分配,最大负荷与最小负荷不宜超过三相负荷平均值的()。
A.115%和85%
B.110%和90%
C.120%和80%
D.105%和95%
参考答案:A
若圆锥的侧面展开图是一个弧长为24π的扇形,则这个圆锥底面半径是______.
37.The students have been told that under no condition______the mobile phone in class.
A.they could use
B.they may use
C.may they use
D.would they use