浦肯野氏纤维细胞有自律性是因()。
A.O期去极化速度快
B.4期有舒张期自动去极化
C.2期持续时间很长
D.3期有舒张期自动去极化
E.1期持续时间很长
参考答案:B
Although the film star has got a tight schedule these days, our boss is still _________ to have him invited to the party for the promotion of our new product.
A.concerned
B.determined
C.frustrated
D.annoyed
资产配置需求考虑的因素不包括税收考虑。( )