[问答题] 简述平滑肌瘤。

The starting air system usually has （） to prevent starting if anything is not in order. ["drain cocks","vent valves","counteracts","interlock"] 在计算机的发展历程中，操作系统出现在（）。 ["第三代","第四代","第二代","第一代"] 在下列解冻方法中，效果最好的是（）。 ["空气解冻","真空解冻","蒸汽解冻","盐水解冻"] 真空冷却适用于（）。 ["鸡蛋","猪肉胴体","叶菜","大海鱼"] （）chart 3994，positions read from this chart should be shifted 0.03 minutes Northward． ["To consider","To check","To examine","To agree with"] 简述平滑肌瘤。