lower mast 中文意思是什麼
lower mast
解釋
桅柱-
The pipe racks are moved to and from their stored position by a hydraulic cylinder attached between the mast frame and the lower swing arm
管架是通過一個裝在支架框和下搖動臂之間的液壓缸往返于其貯存位置的。 -
The lower end of a mast
桅腳,桅跟船桅下面一端
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