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【单选题】
20世纪50年代,我国为了经济建设发展,首先向( )学习工业厂房的标准化设计和预制建设技术。A.
德国
B.
意大利
C.
瑞典
D.
苏联
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A.
come over to
B.
get back to
C.
come out of
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【单选题】— I hear the famous singer Xu Song may come to Weifang next month. — Really? _______ he comes, my younger sister will be very excited.
A.
If
B.
Until
C.
Unless
D.
Before
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【单选题】成年人骨的特点是 ( )
A.
有机物多，无机物少，易骨折
B.
无机物和有机物比例合适，既有一定强度，又有一定韧性
C.
有机物多，无机物少，易骨折变形
D.
有机物多，无机物少，不易骨折和变形
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