颈内动脉和颈外动脉的区别是()
A.在颈部有无分支
B.在颈动脉三角的走行位置
C.术中暂时阻断其血流,颌外动脉及颞浅动脉的搏动是否消失
D.都对
E.都不对
参考答案:D
丁烷的二氯取代物的同分异构体共有( )
A.8种
B.9种
C.10种
D.11种
Assertive behavior involves which of the following elements
A.Expressing an air of superiority.
B.Saying what is on your mind at the expense of others.
C.Avoiding unpleasant situations and circumstances.
D.Standing up for your rights while respecting the rights of others.