影响油品介质损耗因素的原因有哪些?
参考答案:
1、与施加的电压值及频率有关,
2、与测定时的油品温度有关,
3、与测定时的空气湿度有关,
4、与油品的净化程度和老化深度有关。
The moment the 28th Olympic Games _______ open, the whole world cheered. [ ]
A. declared
B. have been declared
C. have declared
D. were declared
通常,由200mL全血分离的血浆所制备的IU冷沉淀要求Ⅷ因子含量不低于()。
A.30IU
B.35IU
C.40IU
D.45IU
E.50IU