特别潮湿的场所、导电良好的地面或金属容器内工作的照明电源电压不大于（）
A.36V
B.24V
C.12V
D.6V
参考答案：C
—Would you like to go and see Avatar with me tonight?
—Thank you very much, but I _______it already.[ ]
A. see
B. will see
C. have seen
D. am seeing
遮色瓷层的厚度应不小于（）
A．0.2mm
B．0.8mm
C．1～1.5mm
D．2mm
E．5mm
