316或317不锈钢闸板具有很好的耐腐蚀性能.Gates are available, 316 or 317 steel for corrosion resistance.闸板防喷器是石油钻井过程中的一种重要设备.Ram - type blowout preventer is important equipment used in oil drilling operation.手动或执行机构推动摇杆使扇形闸板沿轴心旋转开启,物料随即下落...
" You've slaved a whole year, why not have a bite?'she would say.“ 你苦奔了一年, 还不吃一口 哪 ?During these first weeks she slaved joyfully.在最初的几周里,她干得很高兴.He was in the studio tearfully erasing all the tapes he'd sla...