已知C5H11Cl共有8种同分异构体,可推知分子式为C5H12O醇(属醇类)的同分异构体的数目共有 ( )
A.9种
B.6 种
C.5种
D.8种
答案:D
It ________him that they were playing a trick on him.
A.occurred
B.came
C.hit
D.made
煤焦油沥青制取针状焦过程中,最重要的步骤是()。
A.石墨化
B.中间相形成
C.融并
D.解体