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手工弯管时，为防止（）变形，采用管内充装填料。填料有石英砂、松香、低熔点金属等，其中（）为常用填料。
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【单选题】When stars like our Sun die, they bloat to become red giants and then eject gigantic clouds of gas and dust into space. Increasingly, however, scientists found themselves at a profound loss to explain...
A.
explain-the possible way of death of our Sun.
B.
show the two types of red giants.
C.
discuss on the way of red giants to become white dwarfs.
D.
explore the origin of life.
【单选题】低熔点金属，如锡、铅等，再结晶温度低于室温，那么在室温下对低熔点金属的加工属于什么变形？难熔金属，如钨，再结晶温度在1200℃，那么在1000℃对难熔金属加工属于什么变形？
A.
均为冷变形
B.
均为热变形
C.
冷变形；热变形
D.
热变形；冷变形
相关题目：
【单选题】When stars like our Sun die, they bloat to become red giants and then eject gigantic clouds of gas and dust into space. Increasingly, however, scientists found themselves at a profound loss to explain...
A.
explain-the possible way of death of our Sun.
B.
show the two types of red giants.
C.
discuss on the way of red giants to become white dwarfs.
D.
explore the origin of life.
【单选题】低熔点金属，如锡、铅等，再结晶温度低于室温，那么在室温下对低熔点金属的加工属于什么变形？难熔金属，如钨，再结晶温度在1200℃，那么在1000℃对难熔金属加工属于什么变形？
A.
均为冷变形
B.
均为热变形
C.
冷变形；热变形
D.
热变形；冷变形
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