《防止散装运输有毒液体物质污染规则》中将有毒液体物质按可能对海洋资源或人类健康造成的损害程度分为（）类。
A、4
B、6
C、3
D、5
参考答案：A
A．Opium being made legal in mid-nineteenth-century China.
B．The end of prohibition of alcohol in America in the 1920s and 1930s.
C．Drug pushers making billions of dollars each year.
D．More money being needed in education and medical care.
求作立体的第三投影图。
