自由基积累的时间也叫()。
A、积累期
B、诱导期
C、累积期
D、成长期
参考答案:B
The manager was absent because of illness; ______,the meeting was put off until tomorrow.
A.as a result
B.what's worse
C.in other words
D.by the way
钢铁材料淬火后形成的最后组织是()。
A、奥氏体
B、铁素体
C、马氏体