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科研基建费为多少亿元()A.76.3B.64.2C.95.29D.85.6
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科研基建费为多少亿元() A.76.3 B.64.2 C.95.29 D.85.6
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:93, 114, 136, 159,()A.180 B.183 C.185 D.187
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76,95,159,187,278,()A.343 B.476 C.395 D.369
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76, 95, 159, 187, 278, ()A.343 B.476 C.395 D.369
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76,95,159,187,278,()A.343 B.476 C.395 D.369
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用排子拖运重物,当重物在400~500kN时,一般选用合适的滚杠直径为()。A.φ76×10B.φ108×12C.φ159×