基本有机化工原料的“3311”指的是()。
A.三萘、三烯、一炔、一苯
B.三炔、三苯、一烯、一萘
C.三烯、三苯、一烃、一萘
D.三烯、三苯、一炔、一萘
参考答案:D
Nowadays sending e-mails to each other is a way many a student _______ what they think.
A.conveys
B.delivers
C.express
D.account
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