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【填空题】

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】基托发生变形的原因不包括

A.
装盒压力过大
B.
装盒压力不足
C.
基托厚薄差异过大
D.
冷却过快
E.
升温过快