粉尘收集器常见的故障有（）。
A、过滤滤芯脱落
B、催化剂粉尘卸不出
C、除尘风量增大
D、反吹阀门故障
参考答案：A, B, D
The women’s club _________ Lin, a foreign company employee who used to pay little attention to her appearance, to improve her dress style and become more confident and open-minded.
A．enabled
B．had enabled
C．has enabled
D．enables
某宾馆门厅9m×9m，为了提高净空高度，宜优先选用( )。
A．普通板式楼板 B．梁板式肋形楼板C．井字形密肋楼板 D．普通无梁楼板
