禽流感抗原微量血凝试验,反应板孔内终体积为()微升,试验中所用PBS的PH值为(7.2),浓度为(0.01mol/L)。
A.25
B.50
C.75
D.100
参考答案:C
―I’ll be away on a business trip. Would you mind looking after my cat?
―Not at all. ___________.
A.I have no time
B.I’d rather not
C.I’d like it
D.I’d be happy to
滚子从动件盘形凸轮机构的滚子半径应()凸轮理论廓线外凸部分的最小曲率半径。
A.大于;
B.小于;
C.等于