被朱德称为“四方面军最年轻有为的军级干部”的烈士是()。 ["陈海松","孙玉清","李先念","董振堂"]
线粒体DNA分子的特点是() ["线状","环状","与组蛋白结合","不与组蛋白结合","信息量较大"]
氦氖激光产生的激光波长为:() ["530nm","633nm","670nm","790nm","820nm"]
以下哪个不适合写微信个人签名?() ["A、讲清楚自己干什么","B、讲清楚自己的优势和特长","C、融入数字","D、结合心情"]
少数发芽晚、长叶较困难的树种,在()时栽植最为适宜。 ["早春","秋季","雨季","晚春"]
什么是折冲水流?产生的原因是什么?如何防止?