血管活性肠肽瘤(VIP瘤)所致腹泻的性质为
A．渗透性腹泻B．分泌性腹泻C．渗出出性腹泻D．动力性腹泻E．吸收不良性腹泻
参考答案：B
— The pop group S.H.E is said to have been invited to 2013 CCTV Spring Festival Show.
— Really? It’s a long time _______ they three performed together on the mainland.
A．since
B．that
C．when
D．before
如下图所示，通电导线均置于匀强磁场中，其中导线受安培力作用的是 ( )
