所谓的创作者是指完全不借助市场的情况下自己开发一款全新的产品。
参考答案：错
直放站系统中覆盖天线与施主天线之间的隔离度应大于直放站实际工作增益加上冗余储备，冗余储备为（）
A.3dB
B.5dB
C.10dB
D.15dB
－ It seems to me traveling by plane is dangerous.
－ I don’t think so. ______ planes have the best safety records.
A．At most
B．At least
C．At last
D．At present
