[单选] 104型分配阀在组装时，须在（）下套装矿30mmX25.5mmX8mm套圈。

化能自养菌还原力的产生是在消耗ATP的情况下通过反向电子传递产生的。 Write a memo in about 50 words. You received a letter from a British customer complaining of the late delivery of their Order No.366.Then you looked into the matter and found it was the fault of your dispatch department.Write a short memo to your assistant, Jack Zhou. ·Ask him to visit your dispatch department and urge them to dispatch the order. ·Specify the goods, quality, and the deadline for dispatch. ·Add any relevant information you can think of. 当压力容器上只设置一只安全阀时，其开启压力不得超过容器的（）。 工作压力。 操作压力。 最高允许工作压力。 设计压力。 国际分工的类型有（）。 垂直型国际分工。 水平型国际分工。 间接型国际分工。 直接型国际分工。 混合型国际分工。 简述艺术作品的三个层次。 104型分配阀在组装时，须在（）下套装矿30mmX25.5mmX8mm套圈。