The interval between hours of rest for seafarer shall be ______.
A.less than 6 hours
B.more than 6 hours
C.at most 6 hours
D.at least 6 hours
正确答案是D
The interval between hours of rest for seafarer shall be ______.
A.less than 6 hours
B.more than 6 hours
C.at most 6 hours
D.at least 6 hours
正确答案是D