柴油精制的目的主要是除去含氧化合物如环烷酸、酚类及硫化合物等,从而使产品的硫含量、()、酸度等指标合格。
A、银片腐蚀
B、铜片腐蚀
C、馏程
D、密度
参考答案:B
––– Do you think it's a good idea to make friends with your students?
–––________, I do. I think it's a great idea.
A.Generally
B.Eventually
C.Evidently
D.Actually
侨民汇款、旅游开支、服务偿付等属于有形贸易结算。