混合血栓通常见于
A．静脉血栓尾部
B．心瓣膜闭锁缘
C．毛细血管内
D．静脉血栓体部
E．静脉血栓头部
参考答案：D
直流电路中，电感元件相当于开路。（）
He is ______ as a leader but he hasn't ______ in teaching.
A．success; many experiences
B．a success; much experience
C．great success; an experience
D．a great success; an experience
