内生菌根endomycorrhiza
对人的安全电压为（）伏。 ["6","12","24","36"]
挡墙尺测量上宽的范围是（）。 ["0.7-0.9","0.8-0.9","0.9-1.2","1.0-1.3"]
桥上无缝线路应定期测量长轨条的爬行量，并作好记录。固定区爬行量超过（）时，应分析原因，及时整治。 ["10mm","20mm","30mm","40mm"]
转载台制做自然坡面时需要（）。 ["把货全部推掉","制作标准挡墙","视情况决定","加高挡墙"]
菌根mycorrhiza
