CAN数据总线的终端电阻是为了防止CAN总线信号在CAN总线上产生变化电压的反射。
参考答案：对
By the time you get to Shanghai tomorrow, I_____ for Chongqing.
A．would have left
B．have left
C．shall have leaving
D．will have left
脑肿瘤PET显像的优势是（）。
A.对脑瘤分期
B.判断放化疗效
C.观察是否复发
D.发现术后残余组织
E.良恶性鉴别优于CT
