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【单选题】
正常人精子浓度为:A.
(10~50)×10^9/L
B.
(50~100)×10^9/L
C.
(60~120)×10^9/L
D.
(60~150)×10^9/L
E.
(100~150)×10^9/L
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A.
to risk going
B.
risking to go
C.
for risk to go
D.
risk going
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【单选题】关于肿瘤分级的描述不正确的是
A.
恶性肿瘤的分级是描述其恶性程度的指标
B.
肿瘤的组织学级别越高，恶性度越低
C.
肿瘤的分级是制订治疗方案和估计预后的重要指标之一
D.
高分化肿瘤一般不发生转移
E.
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