对主减速器齿轮齿面喷丸处理有可能提高（）寿命。
A.15%
B.35%
C.50%
D.80%
参考答案：B
个性中具有核心意义的、表现一个人对现实稳定的态度和相应的习惯化的行为方式叫（）
A．能力
B.气质
C．性格
D．习惯
The world seemed as if it was ___________. In a flash everything was destroyed.
A．at an end
B．in the end
C．by the end
D．at the end of
