石油化工企业的生产是以原油()或不同石油馏分为原料。
参考答案:天然气
__ __ many Chinese women have received higher education, there are still obstacles that prevent them from enjoying the same opportunities for education and employment as men.
A.Whether
B.Because
C.When
D.Although
下列国家属于发达国家的是( )
A.中国
B.孟加拉国
C.日本
D.印度