试题与答案

含草酸钙方晶的晶鞘纤维()A.Bundles of partially lignif

题型:单项选择题

题目:

含草酸钙方晶的晶鞘纤维()

A.Bundles of partially lignified fibres with crystal sheaths

B.Numerous colourless single fibres, often whole with narrow lumen

C.Parenchymatous cells,fibres,and vessels

D.Starch granules present,fibres and sclereids absent

E.Fibres with crystal sheath containing calcium oxalate prisms

答案:

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参考答案:B解析: 经营差异率=净经营资产净利率-税后利息率,如果经营差异率为正值(净经营资产净利率大于税后利息率),借款可以增加股东收益;如果它为负值,借款会减少股东收益。由此可知,在不降低股东收益的...

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