what does “lifebuoy with light and smoke” mean?

what does “lifebuoy with light and smoke” mean?

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What ________ the notice________? A. is, sayB. is, saidC. did, sayD. does, say
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x线平均波长(λmean)与最短波长(λmin)的 关系是A.λmean =3λminB.λmean =2.5λmin x线平均波长(λmean)与最短波长(λmin)的 关系是A.λmean =3λminB.λmean =2．5λminC.λmean =2λminD.λmean =l．5λminE.λmean=λmin
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________ your mother ________ some cleaning on Sundays? A.Does…doesB.Do…doesC.Does…do
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X线平均波长（λmean）与最短波长（λmin）的关系，正确的是A、λmean=3.5λminB、λmean=3.2λminC、λmean=2.8λminD、λmean=2.5λminE、λmean=2.2λmin
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4．—_________ Mike________ his homework in the evening?—No，he doesn't．A． Do；doesB． Does；doC． Do；doD． Does；does
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Which of the following may illustrate the difference between "competence" and__________ "performance"?A．What a person "knows" and what he/she "does".B．What a person "can do" and what he/she "does".C．What a person "does" and what he/she "knows".D．What a person "does" and what he/she "can do".
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Miller金字塔模型描述临床技能评价方法，从底到顶的四个层次分别为（）A．DOES- KNOW HOW- KNOW-SHOWB．KNOW-KNOW HOW- SHOW- DOESC．KNOW-KNOW HOW- DOES- SHOWD．DOES- KNOW- KNOW HOW- SHOW
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