我国小麦单产达到世界平均水平的1.6倍
Жители Санкт-Петербурга устроили «крысогон»17:52
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New analysis of Apollo Moon samples finally settles debate: « For decades, scientists have argued whether the Moon had a strong or weak magnetic field during its early history (3.5 - 4 billion years ago). Now a new analysis shows that both sides of the debate are effectively correct. »
· 王芳 · 来源：tutorial资讯