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【单选题】
纯尿酸结石的非手术疗法应除外A.
低嘌呤饮食
B.
多饮水
C.
碱化尿液
D.
酸化尿液
E.
口服别嘌呤醇
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举一反三
【单选题】Which of the following statements concerning testing and maintenance of SARTs is true?
A.
An at-sea GMDSS maintainer is not able to test a SART as it is hermetically sealed.
B.
Testing a SART should be performed only in controlled environment as a test signal may be misinterpreted as a genuine distress situation.
C.
A SART's battery must be replaced within ninety (90) days after the expiration date imprinted on the unit.
D.
A SART's battery must be replaced within sixty (60) days after the expiration date im printed on the unit.
【单选题】I’m disappointed with the new officers elected in our club, but there is no point _____ about it. A. to worry B. in worrying C. with us worrying D. if we worry
A.
to worry
B.
in worrying
C.
with us worrying
D.
if we worry
【简答题】在弱酸作用下,绿色的叶绿素溶液会变成 色。在反射和折射光下叶绿素溶液会变成 色,这就是叶绿素的 。
【简答题】三个连续奇数的和是21，则它们的积是______．
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