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【多选题】
金属切削时,刀具切入工件使切削层金属转变成切屑所需要的力称为切削力。切削力的来源有:A.
切削层金属、切屑、和工件已加工表面的弹性变形和塑性变形
B.
主切削力
C.
切屑与前刀面之间的摩擦力
D.
工件加工表面与刀具后刀面的摩擦力
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】下列关于理财主体假设说法不正确的是( )。
A.
理财主体假设明确了财务管理工作的空间范围
B.
理财主体必须有独立经营权和财权
C.
理财主体一定是法律实体，即法律实体一定是理财主体
D.
理财主体假设可以派生出自主理财假设
【单选题】He promised ___ his old friend during his stay in Qingdao.
A.
see
B.
seeing
C.
saw
D.
to see
【判断题】Dwight Knight was certain to draw up the contracts when he promised to his client.
A.
正确
B.
错误
【单选题】He promised that he would never let me down and he his word eventually.
A.
stick to
B.
stick with
C.
stick by
【简答题】My uncle had a small farm. He also worked in a . One autumn, he promised to help his neighbor harvest(收割) their corn（玉米）. , after harvesting their corn, my uncle’s little machine broke. the same time,...
【简答题】真正的理财主体应具备以下特点 : ( 1)理财主体必须有 ; ( 2)理财主体必须有 ; ( 3)理财主体一定是 ,但法律实体并不一定是理财主体。
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