【单选题】Precaution to be observed when pouring molten metal into the pouring basin is
A.
The pouring basin should not be kept full during the pouring
B.
The pouring basin should be kept full during the pouring
C.
The metal should be poured as fast as possible to reduce the drop in metal temperature
【多选题】下列关于针对消费者的促销活动的形式,主要包括( )。
【简答题】输尿管盆部,在男性走行于____后方并与之交叉;在女性,则在宫颈外侧约2.5cm处从后下方绕过____后行向内下至膀胱底穿入膀胱壁内。
【判断题】处于临界点 A 1 温度以下的奥氏体称为过冷奥氏体。( )