A．线速度不变
B．角速度不变
C．向心加速度不变
D．向心力不变
答案：B
Tom was _____ to win the first prize in the competition, but his illness made him miss the chance. [ ]
A. possible
B. probable
C. likely
D. maybe
期权交易的绝大部分均是通过履约平仓的方式进行的。（）
