...本发明涉及一种发条传动装置(spring motor)与阻力制动器(drag brake),其可用于打开与关闭或倾斜用于建筑开口的覆盖物 (covering),诸如软百叶帘、百折帘、垂直帘、其它可展开材料和其 它机械装置。
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PH:9.47 for plant ash,9.32 for covering material
pH值:草木灰9.47,1号覆盖物9.32,2号覆盖物9.30;水分的范围:草木灰15.1%-60.3%,1号覆盖物18.21%-55.6%,2号覆盖物18.32%-54.0%。
参考来源 - 广西农村生态卫生厕所的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
被子植物的种子被另一层覆盖物包裹着。
In the angiosperm the seeds are wrapped in an additional layer of covering.
这就引出了另一个我们需要考虑的变量——建筑材料、墙壁及地板覆盖物的声学性质。
That brings me to another variable we need to consider—the acoustic characteristics of the building materials as well as the wall and floor coverings.
那让我想起另一个我们需要考虑的因素，建筑材料的声学特性，以及墙壁和地板的覆盖物。
That brings me to another variable we need to consider, the acoustic characteristics of the building materials as well as the wall and floor coverings.
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