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下列物体: ①太阳②月亮③星星④夜明珠⑤钻石⑥打开的电视机⑦灯笼鱼,其中一定是光源的是_________;一定不是光源的有_______。(只填序号)
1年前
—Would you like some pop? —________. I would like some tea.
1年前
One of the d __________ of the job is the long work hours.
1年前
The land in the southwest of China is in great need of _______.
1年前
证明不管b取何值,方程y=x^3-3x+b=0在区间[-1,1]上至多有一个实根
1年前