单项选择题
A.It is corrosive
B.It is odorless
C.It is visible as h blue fog
D.It has a distinctive taste
单项选择题 The percentage of impurities in a specific fuel oil sample is determined by （）.
单项选择题 If your vessel bums 8 tons of fuel per hour at 15 knots, how many tons per hour will it burn at 18 knots?（）
单项选择题 Which of the following statements is correct concerning the “flash point ” of a liquid?（）