若a,b为有理数,则下列说法中正确的是[ ] A.若a≠b,则a2≠b2 B.若

题型:选择题

问题:

若a,b为有理数,则下列说法中正确的是[ ]

A.若a≠b,则a2≠b2

B.若a>|b|,则a2>b2

C.若|a|>|b|,则a>b

D.若a2>b2,则a>b

考点:有理数的乘方
题型:选择题

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如图所示,物体重2000N,当它沿水平地面匀速运动时所受的阻力为240N,若不计滑轮的重、绳重与摩擦,使物体以1m/s的速度匀速前进,经过10s时间,拉力的大小F=______N,拉力的功率是______W.

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通信网按运营方式分()网和()网

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无论用工单位是否直接支付劳动报酬,劳务派遣人员的填报单位均为______。

A.劳务派遣单位
B.订立劳动合同的单位
C.户藉所在地行政单位 D.实际用工单位

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属于急诊手术的是()

A.胃癌根治术

B.胃、十二指肠溃疡的胃大部切除术

C.脾破裂

D.腹股沟疝修补术

E.胆囊切除术

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