理解下面谚语的含义,选择正确答案。
A.多读 B.多练 C.多问 D.多思
①圆柱 ②圆锥 ③球 ④正方体 ⑤长方体(请填上正确的序号).
It seems very difficult to ________ the child crying. Please take him to his mother.
随着全球气候异常变化加剧,大范围的冰雪灾害发生的频率显著增加,对电网造成的危害也越来越大.如图所示,若在110kV的输电线中通过700A的电流,则短时间内就可以使电线上的冰融化,达到快速除冰的效果,那么此时输电线中输入的电功率为 ____ W.