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【单选题】
屏蔽效应起着 ( ) 。A.
对核电荷的增强作用
B.
对核电荷的抵消作用
C.
正负离子间的吸引作用
D.
正负离子间电子层的排斥作用
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【单选题】不同种族人的皮肤特点不一样，容易出现的问题也不同，以下说法错误的是()
A.
黄种人皮肤最容易敏感
B.
白种人皮肤容易晒伤，导致过早老化
C.
白种人皮肤纹理粗糙，黄种人皮肤细腻、弹性好
D.
黑种人皮肤汗腺、皮脂腺发达，不容易干燥和形成瘢痕
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