– I found my sister ______ my things and took my new magazines. What should I do?– I guess you should tell her it's not right.
A:looking through
B:looking up
C:looking for
如图是某简单组合体的三视图,则该组合体的体积为( )
一个带电量为q的检验电荷在电场中某点受到的电场力大小为F,该点场强大小为E,则图中能正确反映这三者关系的是( )
关于光纤通信,下列说法错误的是( )