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2岁男孩，生后4个月逐渐出现智力低下，毛发颜色变浅、皮肤白皙、抽搐三次来诊。本病可能的病因是
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China is a country of varied topographical features with _____ in the west and _____ in the east.
_________ and opening-up are the two fundamental state policies of China. They have not only promoted the sustained, swift and sound development of China’s national economy, but also helped restructure its economic system.
Taking a bird's-eye view of China, the terrian gradually descends from west to east like ______ steps of staircases.
下列分子中，由极性共价键形成的非极性分子是：
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