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【单选题】
根据数据库数据模型（ ）的不同，可把数据库管理系统分为层次型、网状型、关系型三类。A.
组织结构
B.
使用范围
C.
隶属系统
D.
设计方法
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举一反三
【单选题】He took the blind girl ’ s arm and her through the doorway.
A.
sent
B.
guided
C.
had
D.
attend
【简答题】A blind boy sat there with a hat by his feet. He held up a sign which said, “I am blind, please help.” There were only a few coins in the hat. A man was walking by. He took out a few coins and dropped...
【单选题】How did Braille become blind?
A.
He was born blind.
B.
He became blind as a result of an accident.
C.
After taking some medicine, he became blind.
【单选题】关于髓袢说法错误的是（）
A.
髓袢升支粗段是NaCl重吸收的主要部位
B.
髓袢升支细段对水不通透，而对Na + 和Cl - 却易通透
C.
髓袢是肾小管其中的一段
D.
呋塞米通过抑制髓袢升支粗段达到利尿作用
E.
髓袢降支细段的钠泵活性很高，对Na+通透性较高，对水不易通透
【简答题】He took the blind girl’s arm and _____her through the doorway.
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