关于胎膜的组成，正确的是()
A．绒毛膜、真蜕膜
B．底蜕膜、羊膜
C．包蜕膜、羊膜
D．外层绒毛膜、内层羊膜
E．外层羊膜、内层绒毛膜
参考答案：D
The famous writer’s play, ________ in one of my books, was published in 1963.
A．to mention
B．mentioned
C．to be mentioned
D．mentioning
可以用断、接空载线路的方法使两电源解列或并列。
