戊型肝炎的主要传播途径是（）
A.粪--口传播
B.血液传播
C.性行为传播
D.飞沫传播
E.虫媒传播
参考答案：A
It's six o'clock in the morning. It's time to ____.[ ]
A. do homework
B. get up
C. have lunch
D. go home
简述G-1-100A型半自动气割机的传动原理？
