中国地震台网正式测定：04月15日09时43分在四川内江市资中县（北纬29.67度，东经104.85度）发生4.1级地震，震源深度9千米。
bsp;
xual propagation, shortening the breeding cycle to within five years and addressing key constraints such as low natural reproduction rates (just over 20 percent), scarce high-quality germplasm, and sl
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