下列介质可以记录模拟声音信号的是（）。
A.存储卡
B.磁带
C.硬盘
D.光盘
参考答案：B
When _______cruel man was hurting the children, there were no adults around who were able to stop______hurting.
A．the, the
B．the, 不填
C．a,不填
D．a, a
某一冷轧工作辊直径为510mm，压下量为1.8mm，求其咬入角α是多少？（cos4.8°＝0.9965，cos5°＝0.9962）
