以下哪一项不属于外科致病因素
A.六淫邪毒
B.外来伤害
C.感受特殊之毒
D.气血凝滞
E.房室损伤
参考答案:D
根据题意作图.
(1)请在图上准确画出所给入射光线经两平面镜反射的反射光线;
(2)如图所示,一束光射向三棱镜,画出这束光透过三棱镜两次折射的大致光路;
(3)完成图甲、乙光线经过透镜的光路图.
Each machine in the internet is assigned a unique network address,called(),that is used to identify the machine for communication purposes
A、MAC address
B、IP address
C、host address
D、domain name address