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【单选题】
X线管灯丝是由()制成
A.
铜
B.
钨
C.
钼
D.
石墨
题目标签：灯丝
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举报参考答案：
举一反三
【单选题】如图，用一块磁铁接近发光的白炽灯泡，可以看到灯丝颤抖起来.关于这一现象，以下说法中正确的是（ ）
A.
这是一种电磁感应现象
B.
这是因为通电的灯丝受安培力作用的结果
C.
如果灯泡中通过的是恒定电流，也会发生同样的现象
D.
磁铁靠近不通电的灯泡也会发生同样的现象
【单选题】Radio and Television Radio and television were major agents of social change in the 20th century. Radio was once the center for family entertainment and news and television enhanced this revolution by...
A.
was very popular among the public
B.
was the symbol of family entertainment
C.
had developed to a high level
D.
was facing some technical problems
【单选题】关于Χ线管阴极灯丝的描述，正确的是
A.
由钨丝制成绕成，螺管状
B.
由银丝制成绕成，螺管状
C.
由银丝制成绕成，栅网状
D.
灯丝的蒸发率要高
E.
灯丝制成直线状
相关题目：
【单选题】如图，用一块磁铁接近发光的白炽灯泡，可以看到灯丝颤抖起来.关于这一现象，以下说法中正确的是（ ）
A.
这是一种电磁感应现象
B.
这是因为通电的灯丝受安培力作用的结果
C.
如果灯泡中通过的是恒定电流，也会发生同样的现象
D.
磁铁靠近不通电的灯泡也会发生同样的现象
【单选题】Radio and Television Radio and television were major agents of social change in the 20th century. Radio was once the center for family entertainment and news and television enhanced this revolution by...
A.
was very popular among the public
B.
was the symbol of family entertainment
C.
had developed to a high level
D.
was facing some technical problems
【单选题】关于Χ线管阴极灯丝的描述，正确的是
A.
由钨丝制成绕成，螺管状
B.
由银丝制成绕成，螺管状
C.
由银丝制成绕成，栅网状
D.
灯丝的蒸发率要高
E.
灯丝制成直线状
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