（）是润滑油中的主要理想成份。
A.少环长侧链的环烷烃
B.多环短侧链的芳香烃
C.少环短侧链的芳香烃
D.以上均不对
参考答案：A
— How do you find the bike?
— It's quite different from _____ I bought last year.
[ ]
A. the one
B. that
C. which
D. it
控制水体中微生物生长的方法有哪些？
