经肠道传播的肝炎病毒()
A.HAV
B.HDV
C.HCV
D.HEV
E.HBV
参考答案:A, D
I think you should complain —___________,of course, you are happy with the way things are.
A.if
B.unless
C.as
D.because
喷气纺纱的加捻是由假捻转化为()的过程,这种真捻与环锭纱的真捻具有本质的区别。
A.间隔真捻
B.连续真捻
C.包芯真捻
D.包缠真捻