单项选择题
A.150 millimeters of water pressure
B.125 millimeters of water pressure
C.100 millimeters of water pressure
D.75 millimeters of water pressure
单项选择题 After making the required notification that a large oil spill into the water has occurred，the FIRST action should be to（）.
单项选择题 According to the Chemical Data Guide，which reactive group(s) is/are not compatible with the products polybutene and o-xylene? （）
单项选择题 According to the Chemical Data Guide，1，3 - pentadiene possesses which characteristic? （）