炎症时能引起疼痛的炎症介质有（）。
A.组胺
B.5-羟色胺
C.前列腺素
D.白三烯
E.缓激肽
参考答案：C, E
A Spear or a robot has the quality of technology only when it______.
A．is used both as a cultural and a physical object
B．serves different purposes equally well
C．is utilized by man
D．can be of use to both man and animal
常用的力学性能指标强度分为哪几种？
