【单选题】我国首例器官移植是由吴阶平教授于1960年实行的( )。
【单选题】关于IgG的特性,下列哪项是错误的( )
【单选题】求图中力系的合力FR及其作用位置。【图片】
C.
FR=3 kN, 作用于x=4/3 m 处向下;
D.
FR=3 kN, 作用于x=4/3 m 处向上;
【单选题】我国首例器官移植手术是由著名医学专家吴阶平教授于 1960年实施的( )
【单选题】唯一能通过胎盘,可由母体传递至胎儿血循环的抗体,在新生儿抗感染免疫中发挥重要作用的抗体类型是()。
【单选题】Choose the best topic sentence for the following paragraph: The Americans and the British not only speak the same language but also share a large number of social customs. For example, in both America...
A.
P eople shake hands when they meet each other for the first time.
B.
Promptness is important both in England and in America.
C.
The Americans and the British not only speak the same language but also share a large number of social customs.
D.
most English men will open the door for a woman or offer their seats to a woman, and so will most Americans.