Block proof cover can be made of metal or widely used PVC plastic, the structure is simple for the convenience of installation.
防堵罩可采用金属或使用广泛的PVC塑料制造，结 构简单，安装方便。
This paper introduces a simple graphic method for designing the planar crank slide block mechanism with urgent returning specific property and gives theoretical proof.
介绍了设计有急回特性的平面曲柄滑块机构的简易图解法，并给出了理论证明。
Leak-proof cover can not effectively block, Only absorb part of the oil spill, This is an Englishman myself, have publicly acknowledged the.
防漏罩不能有效封堵，只能吸收部分漏油，这是包括英国人自己在内都公开承认了的。
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