It features precise Swiss quartz movement, and the black touch-screen dial is protected by a scratch-resistantmineral crystal.
它具有精确的瑞士制造石英机芯，黑色触摸屏拨号是由防刮矿物晶体的保护。
3
It is also known to use a heat-resistantmineral material, for example, asbestos in the form of cord or sheet to support the weld pool and the powder covering in the case of a submerged arc.