... Tubular Type 圆管式 Permanent type 保持式 Special for Computer Embroidery Machine 电脑绣花机专用 ...
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通常分为常开型，常闭型和自保持式三种。
Usually divided into normally open, normally closed and self-holding three.
它们也可以作为自保持式单元供应，外圈上有保持套筒(图10)。
They can also be supplied as self-retaining units with a retention sleeve over the outer rings (FIG 10).
问题是在量子力学中，时间保持其牛顿式超然性，提供物质赖以舞动但从不受其存在的影响的舞台。
The snag is that in quantum mechanics, time retains its Newtonian aloofness, providing the stage against which matter dances but never being affected by its presence.
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