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。