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【单选题】
烧结多孔砖的孔洞率为( )。A.
≥ 25%
B.
<25%< /div>
C.
≤ 25%
D.
>25%
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A.
any other part
B.
in any other part
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【单选题】Oil refiners can refine a barrel of petroleum so that it yields either more home heating oil or more diesel fuel. If the price of diesel fuel falls, there is
A.
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B.
a decrease in the supply of home heating oil.
C.
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D.
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E.
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