制定NSF49标准的国家是（）
A.英国
B.德国
C.法国
D.美国
E.中国
参考答案：D
在GMDSS中，中频（MF）通信分系统的工作频率范围是（）。
A.415～4000kHz
B.4.0～27.5MHz
C.30～60MHz
D.156～174MHz
She made it quite clear that she was no longer going to______my selfishness and moodiness. [ ]
A. put up with
B. depend on
C. care about
D. catch up with
