单项选择题
According to the Chemical Data Guide，1，3 - pentadiene possesses which characteristic? （）
A.Colorless liquid，mild aromatic odor B.Pale yellow liquid，strong odor C.Colorless liquid，faint odor D.Straw-colored liquid，sweet-odor
单项选择题 According to regulations，access to a cargo pumproom in a tank vessel carrying grades C or D liquid cargo shall be（）.
单项选择题 Access to a cargo pumproom on a tank vessel carrying grades A，B，C or D liquid cargoes shall be（）.
单项选择题 A synonym for chloroform is（）.
