... double-slit interferometer 双缝干涉仪 double-threaded screw 双头螺旋 double-thrust bearing 对向推力轴承，对向止推轴承 ...
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... 两用照相机 double-slit interferometer 双缝干涉仪 double-threaded screw 对向推力轴承，对向止推轴承 double-wedge ...
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double threaded screw 双纹螺钉 ; 双纹螺丝 ; 双螺纹螺钉
small double-threaded compression screw 小型双端螺纹加压螺钉
sesqui-threaded double-channel screw 一头半螺纹双槽螺杆
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