当肾动脉血压由120 mmHg上升到150 mmHg时,肾血流量的变化是
A. 明显减少
B. 明显增加
C. 无明显改变
D. 先减少后增加
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肾小球率过液中几乎没有蛋白质,其原因是
A. 血浆蛋白的分子量大,不能通过滤过膜上的孔
B. 滤过膜上有带负电荷的成分,可以排斥血浆蛋白
C. 滤过膜上孔的大小和带电荷的成分两个因素共同作用
D. 滤过膜中的内皮细胞层和基底膜层有相同大小的网孔
Which of the following characteristics of X-ray is not utilized for imaging?()
A. penetration (穿透性)
B. absorbability (可吸收性)
C. fluorescent effect (荧光效应)
D. photographic effect (感光效应)
E. ionization effect (电磁效应)
Which of the following imaging examinations does not require radiation protection (辐射防护) for the patients? ()
A. magnetic resonance imaging (MRI)
B. plain CT scan
C. digital radiography (DR)
D. enhancement CT scan
E. soft X-ray radiography
Which of the following imaging examinations does not use X-ray? ()
A. computed radiography (CR)
B. digital radiography (DR)
C. plain CT scan
D. enhancement CT scan
E. magnetic resonance imaging (MRI)