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【单选题】
下列关于城市道路路面排水系统的说法正确的是()。A.
公路和一般乡镇道路采用暗式系统
B.
建筑物密度较高和交通频繁的地区不宜采用暗式系统
C.
城镇的郊区或其他建筑物密度较小、交通稀少的地区应首先考虑采用明沟
D.
城市中排除雨水只可用明沟,采用明沟可以降低造价
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【简答题】句型转换。 1. I like riding bikes.（改为同义句） _____ _____ is riding bikes. 2. The stamp on the desk is Ben's.（对画线部分提问） _____ _____ is Ben's? 3. This is a flower stamp.（改为复数句子） _____ are _____ stamps. 4. They d...
【单选题】My brother _______ while he _______ his bicy c le and h u rt himself
A.
f ell , was riding
B.
fell , is riding
C.
had fallen, rode
D.
had fallen. was riding
【单选题】下列各项中，应采用加权算术平均法计算的有( )。
A.
已知各企业劳动生产率和各企业产值，求平均劳动生产率
B.
已知计划完成百分比和计划产值，求平均计划完成百分比
C.
已知计划完成百分比和实际产值，求平均计划完成百分比
D.
已知生产同产品各企业的产品单位成本和总成本，求平均单位成本
【单选题】A man has genotype A1A2 G1G2 (one each of the A1 and A2 alleles of gene A, and one each of the G1 and G2 alleles of gene G) The A and G loci are on different chromosomes. What gametes will a single me...
A.
2 of A1A2, 2 of G1G2
B.
1 of A1A1, 1 of A1G1, 1 of A2G1, 1 of G1G2
C.
1 of A1, 1 of A2, 1 of G1, 1 of G2
D.
1 of A1G1, 1 of A1G2, 1 of A2G1, 1 of A2G2
E.
None of the above
【单选题】A man has genotype A1A2 G1G2. (one each of the A1 and A2 alleles of gene A, one each of the G1 and G2 alleles of gene G ) The A and G loci are on difference chromosomes. What gametes will many meioses...
A.
1/2 A1A2, 1/2 G1G2
B.
1/4 A1A1, 1/4 A1G1, 1/4 A2G1, 1/4 G1G2
C.
1/4 A1, 1/4 A2, 1/4 G1, 1/4 G2
D.
1/4 A1G1, 1/4 A1/G2, 1/4 A2G1, 1/4 A2G2
E.
None of the above
F.
More information is needed
【单选题】A man has genotype A1A1, G1G2. (He has two copies of the A1 allele of gene A, one copy each of the G1 and G2 alles of gene G). The A and G genes are on different chromosomes. What gametes will a singl...
A.
2 of A1A1, 2 of G1G2
B.
1 of A1A1, 1 of A1G1, 1 of A1G2, 1 of G1G2
C.
2 of A1G1, 2 of A1G2
D.
2 of A1, 1 of G1A2, 1 of G2
E.
None of the above
F.
More information is needed
【简答题】阅读短文，选择正确答案。 Many Americans have been leaving their cars at home and riding to work on bicycles. Andy Clark is the leader of the League of American Bicyclists. His group supports bicycling for fun, fi...
【简答题】听力原文：(A) They're riding in cars. (B) They're riding bicycles. (C) They're riding horses. (D) They're riding behind a motorcycle.
【单选题】下列各项中,应采用加权算术平均法计算的有
A.
已知计划完成百分比和实际产值,求平均计划完成百分比
B.
已知计划完成百分比和计划产值,求平均计划完成百分比
C.
已知各企业劳动生产率和各企业产值,求平均劳动生产率
D.
已知生产同一产品的各企业产品单位成本和总成本,求平均单位成本
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