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【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.
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反馈参考答案：
举一反三
【简答题】膳食调查的目的是了解个体的生活习惯。（ ）
【简答题】绘制晶闸管的等效电路,可以用()个二极管串联表示,也可以用()个三极管表示。
【单选题】膳食调查的目的是了解 ( )
A.
体内营养素水平,早期发现营养不足与缺乏
B.
有无营养缺乏症
C.
膳食组成及营养素摄取情况
D.
机体生长发育情况
E.
有无疾病的危险因素
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