NOSA安键环以（）管理为基础？
参考答案：以“风险”管理为基础
You _____ pay too much attention to your reading skill, as it is so important.
A．cannot
B．should
C．must
D．needn’t
在北纬80度使用EPIRB，应使用（）
A、406MHZ EPIRB
B、1.6GHZ EPIRB
C、VHF CH70 EPIRB
D、都可用
You _____ pay too much attention to your reading skill, as it is so important.