肌丝滑行时，横桥必须与之结合的蛋白是
A．肌凝蛋白B．肌纤蛋白C．肌钙蛋白D．肌红蛋白E．原肌凝蛋白
参考答案：B
When they got to the South Pole, they found the Norwegians had ____ them in the race to be the first ever to reach it.
A．hit
B．fought
C．won
D．defeated
常用于检测淋巴细胞HLA抗原的血清学方法是
A．混合淋巴细胞反应B．凝集反应C．微量淋巴细胞毒试验D．补体结合实验E．双向琼脂扩散实验
