血小板第3因子活性主要是下列哪种物质由膜内侧转向膜外侧所形成的()
A.磷脂酰乙醇胺
B.磷脂酰胆碱
C.磷脂酰肌醇
D.磷脂酰丝氨酸
E.甘油磷脂
参考答案:D
I would rather ________ to work after my graduation, but my father would rather I ________ abroad for further education.
A.go ;had gone
B.go; went
C.went ; went
D.went ; will go
某地区开展1~7岁儿童随机双盲麻疹疫苗免疫接种效果观察,结果免疫接种组儿童1000人中发病5人,未免疫组1000人中发病25人,该疫苗保护率为()
A.80%
B.20%
C.67%
D.80%
E.80%