又被称为中性灰滤光镜的()
A.偏光镜
B.UV镜
C.减光镜
D.柔光镜
参考答案:C
A British man who ____ to play practical jokes ____ his own humorous art work in four major New York museums over the last two weeks.
A.liked; has secretly hung
B.likes; has secretly hung
C.had liked; secretly hung
D.has liked; secretly hung
电源地线和保护地线与交流中性线共同铺彻于同一的走道上。