歼石山绞车的滚筒和导向轮的最小直径与钢丝绳直径之比，不得小于（）。
A.40
B.50
C.60
D.70
参考答案：B
理论培训的基本方法有（）。
A、讲授法
B、讨论法
C、演示法
D、师带徒法
Tom is _____ what he is used to be and he doesn't go to play computer games _____. [ ]
A. no more; any more
B. no longer; any more
C. no more; any longer
D. no longer; any longer
