鈷-60治療機關閉時距離鈷-60源1M處，各方向平均劑量應小于()
A、05mR/小時D
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We_____knowledgefromourfamilies,schools,jobs,andthemassmedia
Decisionmakersmusthavesomewayofdeterminingofseveralalternativesisbest.（）
Agoodworkerinakeyspotcould,hekeptupproduction,takeallthecoffeebreakshewanted,andthebosseswouldverylikelylooktheotherway.
一細長螺線管共有2000匝，其長度為0.6m，真空磁導率μ0=4π×10-7N/A2，若通過的電流為6A，螺線管內的磁感應強度為()
Theteacherrequiredthatallerrorsshouldbe_______eliminatedbeforethestudentsturnintheirtermpaper
