【单选题】The velocity of the apparent wind can be more than the true wind,and come from the same direction,if certain conditions are present.One condition is that the ______.
A.
Ship's speed must be less than the true wind velocity
B.
True wind must be from dead astern
C.
True wind velocity must be faster than the ship's speed
【简答题】Most top-level managers increasingly recognize that participation in ______ gives them an opportunity to explain the ways of business to the public and helps them to manage crises.