—Yes. What a long time!
A:when
B:since
C:until
D:while
She found ____ difficult to settle and calm down in the ____ place, because she was worried about whether they would be discovered.
如图为实验室常用电流表的内部结构图.多匝金属线圈悬置在磁体的两极间,线圈与一根指针相连.当线圈中有电流通过时,它受力转动带动指针偏转,便可显示出电流的大小.下列与此工作原理相同的电器设备是( )