Double screw pump is a kind of double suction not airtight double screw pump.
双螺杆泵为一种双吸式非密闭的双螺杆泵。
Double safety unit prevents screw tap from wearing out.
二重安全离合器装置能防止丝攻之折损。
Structure for the straight screw, single screw, a warhead double-helix single screw, twin screw three.
结构为直螺旋，有弹头单螺、双头单螺、双头双螺三种。
Structure for the straight screw, single screw, a warhead double-helix single screw, twin screw three.
结构为直螺旋，有弹头单螺、双头单螺、双头双螺三种。
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