Giventhatascopedattributecartexistsonlyinauser’ssession,whichtwo,takenindependently,ensurethescopedattributecartnolongerexists?()
A. ${cart=null}
B. <c:removevar="cart"/>
C. <c:removevar="${cart}"/>
D. <c:removevar="cart"scope="session"/>
E. <c:removescope="session">cart</c:remove>
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如果炮泥质量达不到规定标准,使用单位可以拒绝领用。()