例如，能剪切极硬线的省力型斜口钳应该由0.8%碳和一定成分的铬和钒制成。
Can cut very hard line energy type, for example, diagonal cutting pliers should consists of 0.8% carbon and certain components made of chromium and vanadium.
高抗压强度的硬地层，如硬石灰岩。燧岩。硬砂岩。石英岩。石英砂。玄武岩。花岗岩等极硬岩层。
Medium hard formation with high compressive strength. Such as limestone, taconite, blaize, quartzite, silica sand, basalt, granite ect.
硬开关(图26所示)几乎不考虑漏源极电压的最小值。
The hard switching approach (as shown in Fig. 26) doesn't consider the minimum drain-source voltage.
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