在演讲中，听是一种技能，是一种主动行为，而不是一种消极行为。
硅钢车间连退炉通H2作业时必须具备的条件炉温达到（）℃。 ["720","750","760","780"]
测量切边冷轧钢带厚度时，测量点距钢带侧边的距离不小于（）mm。 ["20","25","30","40"]
钢带的厚度、宽度检查部位距钢带两端的距离不小于（）m。 ["3","4","5","不一定"]
If your baby is losing weight, you should（）your doctor promptly. ["advocate","consult","enquire","investigate"]
紫檀木是红木中的极品，老紫檀木呈紫黑色，浸水不掉色。你知道红木当中哪种木能沉于水中？
