如果无形资产使用寿命不确定,则不予摊销。( )
参考答案:对
The teacher told Tom to sit ______ in class.
A.hard
B.hardly
C.straight
D.straightly
"鹦哥嘴"或"红小辫"是形容哪个药材的性状鉴别特征()
A.党参
B.知母
C.防风
D.银柴胡
E.天麻