旋风除尘器的卸尘装置一般应是哪两个要求?
参考答案:
顺利地排出粉尘和保持最大限度的气密性。
You may ask him for about that. [ ]
A. an information
B. information
C. some information
D. some informations
设立保险公司分支机构应遵循哪些原则?