A:飞机轮子上搭地线
B:印染车间保持湿度
C:复印图片
D:电工钳柄装有绝缘套
—As we know it's difficult to live in a foreign country.
—________________ if you can't understand the language there.
如图所示,是小明同学探究“平面镜成像特点”的实验情景: