单项选择题
Fire detecting systems on merchant vessels may be arranged to sense （）.
A.smoke B.rate of temperature rise C.ionized particles D.all of the above
单项选择题 On a tank vessel, which of the following substances would be burning in a class "B" fire?（）
单项选择题 A class "B" fire would most likely occur in the （）.
单项选择题 The International Oil Pollution Prevention Certificate is valid for a period of （）.
