在钻孔中采取Ⅰ、Ⅱ级土试样时，关于取样技术要求，下列（）说法不正确。 （）

A.在软土、砂土中宜采用泥浆护壁

B.如使用套管，应保持管内水位低于地下水位，取样位置应低于套管底1倍孔径的距离

C.采用冲洗、冲击、振动等方式钻进时，应在预计取样位置1m以上改用回转钻进

D.采取土试样宜用快速静力连续压入法

A project manager needs to analyze the project cost to find ways to decrease costs. It would be BEST if the project manager looks at ______ .

A) variable costs and fixed costs
B) fixed costs and indirect cost
C) direct costs and variable costs
D) indirect costs and direct costs