当吊笼停在完全压缩的缓冲器上时，对重上面的自由行程不得小于()。
A、0.1m
B、1m
C、2m
D、0.5m
参考答案：D
阅读判断正误，正确（T），错误（F）。
Jim is from England. He isn’t from the USA. He speaks English. His father is working in Beijing. So he
is studying in a middle school in Beijing. He has classes on weekdays. On Sundays, he often plays games with his Chinese friends. He likes China very much. He can speak a little Chinese now.
( ) 1. Jim comes from the USA.
( ) 2. He has no classes on Sundays.
( ) 3. He can’t speak Chinese.
( ) 4. His father is working in Beijing.
薪酬指导线
