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【简答题】
在立方晶系中，若某一晶向和某一晶面的数字顺序和符号完全相同，则该晶向和该晶面之间互相()。 A平行 B垂直 C成45°夹角
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【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
【简答题】根的初生木质部发育方式是（），而茎的初生木质部的发育方式是（）。
【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】轴的直径为30mm,材料为低碳钢,F=500N,M=100Nm受力如图,(1)确定轴的危险点,并画出危险点的应力状态;(2)求出轴危险点的主应力;(3)按第三强度理论计算其相当应力。
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