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【单选题】
提高砖砌墙体的强度等级的主要途径是( )A.
提高砖的强度
B.
提高砌筑砂浆的强度
C.
以上两种都不能提高
D.
无
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【简答题】Some day small stars ___will become white dwarf stars.(fill in 5 words)
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