Why did Sturgeon's electromagnet could support nine pounds of iron?

A． Because the iron rod was bent into the shape of a “horseshoe”.

B． Because the rod was coated with varnish.

C． Because a layer of copper wire was wrapped around the rod.

D． Because the rod was made magnetic by the passing current.

[主观题]Why did Linda join the American Women's Club of Toronto?(No more than 10 words) (2 marks)

[单选题]Why did the writer choose to compare the master′s programs rather than the

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[单选题]2． Did you enjoy___________ yesterday's football game?A． seeingB． to seeC． watchingD． to watch

[单选题]Why does Wagoner say "There's nothing like a good battle to stir excitement and. get everyone focused" ?（ ）[A] To imply that he used to be an athlete.[B] To show that he is in high spirits.[C] To prove that he is loyal to GM.[D] To indicate that h

[单选题]22． When did Jackie Chan's parents move to Hong Kong?A． They moved to Hong Kong a short time after Jackie Chan was born．B． They moved to Hong Kong a short time before Jackie Chan was born．C． They moved to Hong Kong after they came back from America．

[单选题]Einstein's Theoryof Relativity was so [profound] that only a few scientists

[单选题]Einstein's Theoryof Relativity was so [profound] that only a few scientists

[单选题]One reason why the duration of a portfolio of bonds does not properly refle

[单选题]Einstein's Theoryof Relativity was so [pofound] that only a few scientists