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词汇
Permian
释义
Permian
['pə:miən]
a.
二叠纪的, 二叠纪岩的
n.
二叠纪(岩)
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screw gear
screw gearing
screw head
screw head mandrel
screw impeller
screwing stock
screw jack
screw-joint
screw lubrication
screw machine
screw micrometer
screw motion
screw off
screw on
screw pair
screw pelletizer
screw-pitch
screw pitch
screw-pitch gauge
screw plasticator
screw plate
screw press
screw probe
screw propeller
screw pump
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