第一次工业革命中最有影响力的技术发明是 [ ]
A．珍妮纺纱机
B．联动式蒸汽机
C．蒸汽机车
D．“搅炼和碾压法”
答案：B
Liu Yuping is from a beautiful country.
A．lives in
B．was born in
C．comes from
D．likes going to
LOR选择开关的定义？
