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1·Our company can supply: Diamond bit series, bi-center bit series, coring bit series, steel cone bit series, insert bit series, etc.

我公司可提供：金刚石钻头系列、双心钻头系列、取芯钻头、钢齿牙轮钻头系列、镶齿牙轮钻头系列等。

2·The insert and update methods are a bit more complex because they need to format the SQL statements with additional fields for the input data.

insert和update方法要复杂一些，因为它们需要使用用于输入数据的额外字段格式化sql语句。

3·Insert tooth bit applies in every serious geography especially hard rock; it has stable drilling speed and can drill the hardness of rock at 1-6 grades.

镶齿牙轮钻头主要适用于地质较硬的岩层，它钻进速度稳定，可以钻进1-6级地质硬度，适用于各种恶劣的地质环境。