what does “lifebuoy with light and smoke” mean?
X线平均波长(λmean)与最短波长(λmean)的关系是A.λmean=3λminB.λmean=5λminC.λmean=2λminD.λmean=5λminE.λmean=λmin
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-Does "am"___ afternoon-No, it morning.A. means,meanB. means, meansC. mean, means
What ________ the notice________?A. is, sayB. is, saidC. did, sayD. does, say
x线平均波长(λmean)与最短波长(λmin)的 关系是A.λmean =3λminB.λmean =2.5λminx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
What _______ “Mr” mean?A. isB. doesC. Do
________ your mother ________ some cleaning on Sundays?A.Does…doesB.Do…doesC.Does…do
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