记录到数码摄像机的摄像带上的信号是数字信号。( )
参考答案:错
—How about going to visit the Great Wall?
—_______ [ ]
A. Thank you
B. Good idea
C. Never mind
D. Not at all
木瓜含量要求中,醇溶性浸出物,用乙醇作溶剂不得少于()。
A.10%
B.20%
C.15%
D.40%