WinterTrees 4their leaves to get ready for winter. They use the food they saved to get through the cold days and nights.
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SpringSpring comes. Ice and snow 5 , and rain falls. The sun shines. New leaves grow on the trees. The green leaves start making food again.
当土质良好时,堆土或材料应距挖方边缘()m以外,高度不宜超过()m。
A. 0.8,1.5
B. 0.5,2.0
C. 0.8,2.0
D. 1.5,1.5
场地开挖土方时,土方边坡自上而下分层开挖时,上台阶应比下台阶开挖深进不少于()
A. 10m
B. 20m
C. 30m
D. 40m
下列情况种,会导致内分泌腺体功能低下的状况是()。
A. 出血
B. 医源性损伤
C. 遗传性疾病
D. 肝功能障碍