【单选题】听力原文:W: In America, many prisoners are having their cases reviewed, and some have even been freed through DNA testing. M: Then, how about the ones whose death sentence have already been carried out? Q...
A.
It has helped to find some criminals.
B.
It has found most criminals.
C.
It has freed all the innocent people from prison.
D.
It has freed some innocent people from prison.
【单选题】电路如图 所示,求: S断开时,电压U=_V; S闭合时,电流I=_A。
【多选题】女性在公共场所拿取低处的物品或拾起落在地上的东西时,下面哪些是正确的:
A.
不妨使用下蹲和屈膝动作,可以避免弯上身和翘臀部;
B.
特别是穿裙子时,如不注意背后的上衣自然上提,露出臀部皮肉和内衣则很不雅观。
C.
既使穿着长裤,两腿展开地弯腰,撅起臀部的姿态也不美观。
【简答题】软磁材料的特点是磁滞回线较______,回线面积较______,磁导率较______,剩磁较______。常见低频软磁材料如______等,用于电机和变压器中的______;常见的高频软磁材料如______等,用于收音机中的______和______。