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原状取土器外径Dw＝75mm，内径Ds＝71.3mm，刃口内径De＝70.6mm，取土器具有延伸至地面的活塞杆，按《岩土

工程勘察规范》(GB 50021—2001)的规定，该取土器为()。

A．面积比为12.9、内间隙比为0.52的厚壁取土器

B．面积比为12.9、内间隙比为0.99的固定活塞厚壁取土器

C．面积比为10.6、内间隙比为0.99的固定活塞薄壁取土器

D．面积比为12.9、内间隙比为0.99的固定活塞薄壁取土器

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