Induced pluripotent stem cells (iPSCs) are adult cells that have been genetically reprogrammed to an embryonic stem cell–like state by being forced to express genes and factors important for maintaining the defining properties of embryonic stem cells.
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We should ensure that there is sufficient evidence before bringing stem cell products into clinical use is a perennial predicament for patients, payers, scientists, clinicians, and regulators.
A. 对
B. 错
下面哪项不属于景别？
A. 全景镜头
B. 特写镜头
C. 移动镜头
D. 远景镜头
镜头成像的原理是利用_______的原理。
A. 小孔成像
B. 视觉暂留
C. 影像幻觉
D. 完形心理学
从照射方向看，光线的种类有正面光、侧光和____________。
A. 自然光
B. 逆光
C. 补光
D. 光位
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