肝炎肝硬化主要阻塞部位()
A．肝静脉
B．窦前
C．窦后
D．门静脉
E．上腔静脉
参考答案：B
实数6的相反数是______．
.
Jenny, your paintings are wonderful. I _____ you learned to paint.
A．hadn’t known
B．didn’t know
C．won’t know
D．haven’t known
