Chinese President Xi Jinping, on November 30, 2013, has _____ legal and scientific prevention and control of HIV/AIDS as well as various social support for carriers and patients.

A．left out

B．called for

C．appealed to

D．turned round

一个CAN总线接口有3个部分组成。其中，最底层为CAN收发器，当受到驱动时，发送器产生显性信号，表示逻辑（）。发送器没被驱动时，产生隐性信号，表示逻辑（）。

A.0；1

B.1；0

C.0；0

D.1；1