皮皮学，免费搜题
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【单选题】
对于半波整流电路，整流系数为（ ）。A.
.45
B.
0.60
C.
.75
D.
0.90
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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】放射性损伤的防范措施中不妥的是
A.
禁忌用力擦拭、掻抓、摩擦、曝晒、紫外线照射等
B.
为保持接受放射部位皮肤的清洁，应经常使用肥皂擦洗
C.
正确掌握照射剂量和时间
D.
尽量减少患者不必要的身体暴露，保持照射区域的标记
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