常见的齿轮损伤有()和()两类。
参考答案:齿面损伤;轮齿折断
Part of the reason Charles Dickens loved his own novel, David Copperfield, was ________ it was rather closely modeled on his own life.(2010·北京)
A.what
B.that
C.why
D.whether
倾听过程的主体是()。
A.倾听者
B.倾听对象
C.倾听环境
D.倾听时间