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【单选题】
当使用电子线照射时，下列方式正确的是（）A.
电子线筒与皮肤表面的距离为6cm
B.
电子线筒尽量靠近皮肤表面
C.
电子线筒与皮肤表面的距离以方便摆位为原则
D.
电子线筒与皮肤表面的距离为1cm
E.
电子线筒与皮肤表面的距离为10cm
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