覆盖在囊胚上面的蜕膜
A．包蜕膜B．底蜕膜C．真蜕膜D．增生期内膜E．分泌期内膜
参考答案：A
改错。
1. Our children is being looked after by their teachers. _________
2. The milk is been produced in the factory now. _________
3. The plan is being talked by our classmates. _________
4. An idea was come into being. _________
5. The beautiful painting is being appreciating. _________
如果一个以太网与一个帧中继网互连，应该选择的互连设备是。（）
A、中继器
B、网桥
C、路由器
D、集线器
