在组装鼓之前圆筒和金属圈都可以被观众检查。
The cylinder and bands may be examined by a spectator before the drum is formed.
流化板的孔隙率可受到严格控制。流化板在组装之前已进行详细检查，并且发货之前所有箱体会进行适合的流化检查。
Porosity of fluidizing plates is rigidly controlled. Plates are closely inspected prior to assembly and all tanks are checked for proper fluidization before shipping.
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