关于人类免疫缺陷病毒的特点,哪项是错误的()
A.主要感染CIM+细胞
B.可引起人类艾滋病
C.可通过性行为传播
D.不能经胎盘传播
E.可通过输血传播
参考答案:D
A.No, it’s open only to teachers and postgraduates.
B.Yes, he can study there if he is writing a research paper.
C.Yes, because he is a senior student.
D.Yes, but he needs the approval of his professor.
制动蹄领蹄的效能因素()从蹄效能因素。
A.小于
B.大于
C.等于
D.A、B、C都有可能