姜黄素分光光度法测定水中硼时，试验所用器皿应选用无硼玻璃、聚乙烯或其他无硼材料。
参考答案：对
液压油箱的主要功用是（）和散热。
The accurate declaration for the export goods is made by the ( ).
A．consignee or his agent
B．consignor or his agent
C．Customs
D．any person
