硫酸钡吸附血浆中主要含下列哪一组凝血因子()
A.因子Ⅶ和因子Ⅹ
B.因子Ⅴ和因子Ⅷ
C.因子Ⅱ,Ⅴ,Ⅶ,Ⅹ
D.因子Ⅰ,Ⅲ,Ⅴ,Ⅶ
E.因子Ⅹ和因子Ⅴ
参考答案:B
He _______ Shanghai, for I saw him talking with the headmaster a moment ago.
A.must have gone to
B.can’t have gone to
C.mustn’t have been to
D.can’t have been to
影响色谱柱分离效率的操作条件有()。
A、色谱柱工作温度
B、载气压力、流速
C、载气性质
D、进样量与进样时间