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【单选题】
如图5所示,弹簧固定在地面上,一小球从它的正上方A处自由下落,到达B处开始与弹簧接触,到达C处速度为0,不计空气阻力,则在小球从B到C的过程中( )A.
弹簧的弹性势能保持不变
B.
弹簧的弹性势能不断减小
C.
系统机械能不断减小
D.
系统机械能保持不变
拍照语音搜题，微信中搜索"皮皮学"使用
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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】列关于阴囊的描述,哪项是错误的?
A.
壁主要由皮肤和肉膜构成
B.
阴囊皮肤薄而柔软
C.
阴囊的浅筋膜内含有平滑肌纤维
D.
由阴囊中隔分为左.右两部
E.
阴囊内只容纳一对睾丸
【简答题】Success is not final and __________ (fail) is not fatal. It is the courage to continue that counts.
【简答题】Success is not final, failure is not f_________(致命的): it is the courage to continue that counts.
【简答题】Please translate the following into chinses. success is not final, failure is not fatal: it is the courage to continue that counts.
【单选题】Which sentence is NOT for success and failure?
A.
A fall into the pit, a gain in your wit
B.
Success is not final, failure is not fatal: it is the courage to continue that counts. (Winston Churchill)
C.
Once bitten, twice shy.
D.
The supreme happiness of life is the conviction that weareloved. (Victor Hugo)
【单选题】下列关于阴囊的描述,哪项是错误的
A.
阴囊壁由皮肤、肉膜、精索外筋膜、提睾肌和精索内筋膜组成
B.
阴囊内只容纳一对睾丸
C.
阴囊的浅筋膜内含有平滑肌纤维
D.
由阴囊中隔分为左、右两部
【单选题】下列哪一项关于乳头状囊腺瘤的描述是错误的?
A.
肿瘤边缘光滑，境界清楚
B.
囊壁厚，囊内的囊液一般为血色
C.
囊壁有实性的乳头状结构突入囊腔
D.
囊壁内衬单层立方上皮
E.
乳头被覆立方或柱状上皮
【单选题】Success is not final, and failure is not deadly. It is the courage to continue ______ counts in life.
A.
that
B.
which
C.
where
D.
when
相关题目：
【单选题】下列关于阴囊的描述,哪项是错误的
A.
阴囊壁由皮肤、肉膜、精索外筋膜、提睾肌和精索内筋膜组成
B.
阴囊内只容纳一对睾丸
C.
阴囊的浅筋膜内含有平滑肌纤维
D.
由阴囊中隔分为左、右两部