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【单选题】
心内膜炎时出现杂音的机理是A.
血流加速
B.
瓣膜口、大血管通道狭窄
C.
心腔内漂浮物
D.
异常通道
E.
瓣膜关闭不全
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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】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
【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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