英语:B
物理:一位细心的同学发现显微镜下面的反光镜两面不同,一面是平面镜,一面是凹面镜,使用时外界光线较亮应选用___平面镜____,光线较弱应选用____凹面镜___.
数学：点P（-2,0）与点Q（4,0）关于直线__X=1_____对称.
1、My pet can _______"Hello!"when I come home.
2个回答
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