标明“100Ω、24W”和“100Ω、25W”的两个电阻串联时,允许通过的最大电流是()。
A.0.7A
B.1A
C.1.4A
D.0.49A
参考答案:D
在如图中填入适当的透镜。
—What’s the matter with you ?
—Oh, I’m not feeling well in the stomach . I so much fried fish just now .
A.shouldn’t eat
B.mustn’t have eaten
C.shouldn’t have eaten
D.mustn’t eat