皮皮学，免费搜题
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搜题
【单选题】
雌激素的生理功能正确的是A.
降低子宫对缩的敏感性
B.
使宫颈黏液分泌减少
C.
使乳腺腺泡增生
D.
有升高体温作用
E.
使子宫内膜增生
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】一对标准直齿园柱齿轮传动,模数为 2mm ,齿数分别为 20 、 30 ,则两齿轮传动的中心距为 。
A.
100 mm
B.
200 mm
C.
50 mm
D.
45mm
【简答题】( ) 4. Running, swimming and playing football can help you to do better at school.
【判断题】( ) 4. Running, swimming and playing football can help you to do better at school.
A.
正确
B.
错误
【单选题】Swimming and playing basketball are his favorite leisure activities. (就划线部分提问)
A.
What are his favorite leisure activities?
B.
What is his favorite leisure activities?
C.
What are his favorite leisure activity?
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