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煤矿开采中,每个生产矿井必须至少有 ()个能行人的通达地面的安全出口,各个出口间距不得小于 ()m。
A. 2,20
B. 2,30
C. 3,20
D. 3,30
“不充分”是经济社会体系结构问题,主要指比例关系不合理、包容性不足、可持续性不够,制约生产率的全面提升。()
Suppose that the transfer of genes between 2 bacteriawas interrupted, that the last gene transferred wasGene A, and that no incomplete copies of a gene weretransferred. Based on this information, Student 1would say that transfer was most likely interruptedhow many minutes after the transfer began?
A. 15
B. 30
C. 45
D. 60
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