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【单选题】
在一段时间内,质点位移的大小为lr ,运动过的路程大小为ls。则lr 与ls 间的关系为A.
lr 一定大于ls
B.
lr 一定不会小于ls
C.
lr 一定小于ls
D.
lr 一定不会大于ls
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举一反三
【单选题】女,45岁,肢体软弱无力、夜尿多2年余,今晨起双下肢不能活动。查体:血压170/100mmHg,均匀性轻度肥胖,双下肢松弛性瘫痪,血钾2.4mmol/L。最可能的诊断为:
A.
原发性高血压
B.
嗜铬细胞瘤
C.
肾性高血压
D.
原发性醛固酮增多症
E.
库欣病
【单选题】In order to cope with most illnesses, the author thinks that people will have to do all of the following except ______.
A.
find more curative rays
B.
produce more curative drugs
C.
develop more powerful diagnostic instruments
D.
see through five inches of living flesh at least
【简答题】A．People will have to rely on Kudzu for a living. B．They will soon be overgrown with Kudzu. C．They will become too hard to plough. D．People will find it hard to protect the soil.
【单选题】In order to cope with most illnesses, the author thinks that people will have to do all of the following except ______.
A.
find more curative rays
B.
produce more curative drugs
C.
develop more powerful diagnostic instruments
D.
see through five inches of living flesh as least
【简答题】The water was so clear that it ______ (reflect) the trees on the river bank.
【简答题】,终岁不闻丝竹声。
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