闪点
参考答案:
闪点是指石油产品在规定条件下,加热到其蒸汽和空气的混合物与火焰接触时会发生闪火现象的最低温度。
----Tony, why are your eyes red?
---I __ up peppers for the last five minutes.
A.cut
B. was cutting
C. had cut
D.have been cutting
淫羊藿温肾助阳作用成分,目前认为是()。
A.生物碱
B.苷类
C.有机酸
D.蛋白质
E.树脂