单项选择题
A.the Canadian Coast Guard
B.Ice Sarnia
C.the Ice Navigation Center
D.the icebreaker assigned to the area
单项选择题 Coiling new rope against the lay，bringing the lower end up through the center of the coil，then coiling with the lay，in order to remove the kinks，is known as（）.
单项选择题 Coast Pilots and navigational charts are kept corrected and up-to-date by using the（）.
单项选择题 Clouds with the prefix “nimbo” in their name（）.