图是一台收音机的屏板,当向右调指针(图中黑块)时,所接收的电磁波
A.频率变大,波长变大
B.频率变大,波长变小
C.频率变大,波长不变
D.频率变小,波长变大
答案:B
已知关于x的方程kx2-x-2=0的一个根为2,则k=______,此时方程的另一根为______.
小题1:He speaks French. ( 对划线部分提问 )
_____ _______ _____ he ______ ?
小题2:Where is your friend from? (同义句)
Where _____ your friend ______ _______ ?
小题3:There are some boys in the room.(改一般疑问句并回答)
______ there ______ boys in the room?
Yes, ____ are ______.
小题4:My brother loves dolphins because they are interesting.(对划线部分提问)
_____ ____ your brother _____ dolphins ?
小题5:Can you tell me how to get to the bank? (同义句)
Please _____ me ____ _____ _____ the bank.