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【单选题】
Those flowers ________ Kate $56.A.
paid
B.
took
C.
cost
D.
spent
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【单选题】2008年诺贝尔生理或医学奖的获得者发现的人乳头状瘤病毒(HPV)和2009年首先爆发于墨西哥的甲型H1N1流感病毒的遗传物质分别是DNA和RNA。下列有关DNA和RNA的比较正确的是 [ ]
A.
分布上，真核细胞中的DNA全部存在于细胞核中，RNA全部存在于细胞质中
B.
从化学组成上，DNA与RNA的碱基完全不同
C.
结构上，DNA多为双螺旋结构，RNA通常为单链结构
D.
鉴定DNA用吡罗红染色剂，鉴定RNA用甲基绿染色
【单选题】只有当（）时才考虑用机器制芯。机器制芯生产率高，紧实度均匀，型芯质量好，便于机械化、自动化。尤其是热芯盒、壳芯盒、冷芯盒等用树脂作黏结剂的制芯方法。
A.
尺寸精度要求高
B.
批量生产
C.
形状复杂
D.
形状简单
E.
尺寸小
【单选题】— Is he your father? — _____. [ ]
A.
No, he is
B.
Yes, he's
C.
No, he not
D.
Yes, he is
【单选题】to literature when very young, he would not be a master of literature today. A. Were he not exposed B. Were he not to be exposed C. Had he not exposed D. Had he not exposed himself
A.
B.
C.
D.
D
【简答题】壳型(芯)法制型(芯)的方法有两种:翻斗法和吹砂法。翻斗法常用于 ,吹砂法用于 。
【单选题】to literature when very young, he would be a master of literature today. A. Were he not exposed B. Were he not to be exposed C. Had he not exposed D. Had he not exposed himself
A.
B.
C.
D.
D
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