事故排油阀应设()钢质截止阀,
A、一个
B、两个
C、三个
参考答案:B
The book mainly deals with the trouble teens might have _____ right from wrong. [ ]
A. distinguishing
B. distinguished
C. to distinguish
D. to be distinguished
数据结构包括数据的逻辑结构、数据的 【2】 以及对数据的操作运算。