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【单选题】
焊接1Cr18Ni9不锈钢和Q235低碳钢，如熔合比为40%，使用（ ）焊条，会使焊缝得到单相奥氏体组织，容易产生热裂纹。A.
A137
B.
A207
C.
A307
D.
A407
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举一反三
【简答题】Where their eating habits have changed,however,and where they have become very similar,is in what happens when people go out to eat.
【单选题】As our eating habits changing, choosing what______is no longer as easy as it once was.
A.
eat
B.
eaten
C.
to eat
D.
to be eating
【单选题】As our eating habits are changing，choosing what is no longer as easy as it once was．
A.
eat
B.
eaten
C.
to eat
D.
to be eating
【单选题】周代分封制下,一些大诸侯不断向周围的夷、戎、狄等少数民族用兵,进而兼并其土地,进行文化渗透;受封的偏远诸侯国也逐步接受了中原文化。这表明分封制
A.
加强了中央对地方的有效控制
B.
构建了国家大一统局面
C.
激化了汉族与少数民族的矛盾
D.
推动了中原文明的传播
【单选题】Our eating habits have changed, ______ has our way of life.
A.
like
B.
as
C.
but
D.
nor
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