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问题 单项选择题 A1/A2型题

关于股骨颈骨折的说法，下列哪项说法不正确（）。

A.多发生于老年人

B.易发生骨折不愈合

C.易发生股骨头坏死

D.常须行手术治疗

E.老年骨折患者较儿童股骨颈骨折患者易发生股骨头坏死

答案

参考答案：E

问答题

铲齿的形状和间距对切削阻力有什么影响？
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单项选择题

IP multicasting is a set of technologies that enable efficient delivery of data to manylocations on a network．Rather than making multiple copies of a message intended to bedistributed to multiple recipients at the (71) of origin of a message，multicasting initiallysends just one (72) and does not copy it to the individual recipients until it reaches theclosest common point on the network，thereby (73) the bandwidth consumed．Networkperformance is significantly (74) because it isn’t bogged down with the processing andtransmission of several large data files；each receiving computer doesn’t have to (75) thetransmitting server for the file．

A．extending
B．minimizing
C．demolishing
D．reducing
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