皮皮学，免费搜题
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【多选题】
视频素材的获取途径有( )A.
通过网络搜寻与下载
B.
拍摄与录屏
C.
通过转换获取
D.
通过视频处理软件自制
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】_____ is the final stage of urine production occurring when the special cells of the renal tubules secrete ammonia, uric acid, and other waste substances directly into the renal tubule.
A.
Filtration
B.
Reabsorption
C.
Secretion
D.
Evacuatio n
【简答题】什么是荷载效应组合？有地震作用组合和无地震作用组合表达式是什么？
【单选题】Special cells, ____, in the epidermis produce the black pigment that gives color to the skin and protects against damage from the ultraviolet rays of the sun.
A.
melanocytes
B.
erythrocytes
C.
leukocytes
D.
phagocytes
【简答题】什么是荷载效应组合?有地震作用组合和无地震作用组合表达式是什么?
【单选题】The basal layer also contains special cells called_______, which produce black pigment that gives color to the skin.
A.
adipocyte
B.
epithelium
C.
keratin
D.
melanocytes
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