蛋泡面坯工艺中，所有工具、容器不能沾油，否则蛋液不起泡。
参考答案：对
The next thing he saw was smoke ________ from behind the house.[ ]
A. rose
B. rising
C. to rise
D. risen
IPSec协议工作在（）层次。
A.数据链路层
B.网络层
C.应用层
D.传输层
