M-shaped ruler is called folding ruler, so it is made into M-shaped ruler, which saves space and is convenient to carry. M-foot examination is to check whether there is necrosis of bilateral femoral heads. If there is no femoral head collapse, it means that it is still in the early stage, and drugs to improve circulation can be applied. In addition, it is also helpful to do more hot massage at ordinary times.

Introduction of folding ruler

The folding ruler originally refers to a wooden ruler with four creases. It is a common measuring tool for measuring wood, marking, processing and manufacturing furniture, and also a common teaching tool. There are also plastic-steel folding rulers, which are mostly made of plastic and stainless steel.

The folding ruler is made into many sections. In the dictionary, the folding ruler should mean folding, but here is the usage of verbs as adjectives, that is, folding.

In mathematics teaching, wooden folding ruler can be used to easily form various teaching aid models such as plane graphics and three-dimensional graphics, and some mathematics teaching demonstrations can be carried out for intuitive teaching. Clever use of wooden folding ruler, multi-purpose, convenient and practical, economical and practical.

All kinds of plane figures are made up of wooden folding rulers. In teaching, polygons such as square, rectangle, trapezoid, triangle, diamond, regular pentagon, regular hexagon, regular heptagon and regular octagon are all made of wooden folding rulers.