单项选择题
A.1~2min B.2~2.5min C.3min D.3~4min
A.5~10s B.10~15s C.15~20s D.20~30s
A.指托板 B.自然指甲 C.手部皮肤 D.左手小拇指
A.必须照射凝胶灯 B.不用照射凝胶灯 C.可以照也可以不照凝胶灯 D.在阳光下照射即可
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