单项选择题
The lockmaster has given you permission to tie off on the lower guide wall to wait your turn to lock through. What should you be most concerned with? （）
A.A downbound vessel B.An upbound vessel C.Current reaction when the lock chamber is being emptied D.Current reaction when the lock chamber is being filled
单项选择题 The length of chain between the anchor and the end of the pendant line is called the（）.
单项选择题 The holding power of an anchor at a given scope of cable increases when the（）.
单项选择题 The holding capabilities of an anchor are determined PRIMARILY by the（）.
