下列关于铸造卡环的叙述正确的是（）

A.铸造卡环的弹性较好

B.铸造卡环固位臂一般需要0.75mm的水平倒凹

C.铸造卡环臂一般制作为圆柱形

D.铸造卡环较锻丝卡环韧性好，不易折断

E.铸造卡环与基牙的接触面积较锻丝卡环大

Channel 13 (156.65 MHz)，the designated bridge-to-bridge channel，may NOT be used to（）.

A.exchange navigational information between vessels

B.exchange navigational information between a vessel and a shore station

C.conduct necessary tests

D.exchange operating schedules with company dispatcher