图所示冲床的最大冲力为400kN，冲头材料的剪切强度极限τb=440MPa，求在最大冲力作用下所能冲剪的圆孔的最小直

ackets. Moreover, the tendency to economically_______ indigenous peoples finds its parallel in the tendency to socially isolate them. (margin)

A．To inquire about switching majors.

B．To find a helping supervisor.

C．To make up the remaining credits.

D．To apply for a master's degree.

Alice was about to _______,when she suddenly found an answer to the question.

[A] make up

[B]look up

[C]tum up

[D] give up

A、They are Americans grouped in tribes.

B、They are different groups of indigenous peoples of the United States.

C、They are a group of people living in the north part of the United States.

D、They are Americans sharing the same language, culture, customs, and politics.

He couldn't make up his ______ about what to do with the money.

A．thought

B．heart

C．mind

D．head

He couldn't make up his ________about what to do with the money.

[A] thought

[B]heart

[C]mind

[D]head

A、make necessary about

B、make sense

C、make a fuss

D、make up

A、make necessary about

B、make sense

C、make a fuss

D、make up