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4.作主語(yǔ)或賓語(yǔ): the+adj表示某一類人或事物, 這種名詞化的形容詞起著名詞的作用, 在句中可以作主語(yǔ)或賓語(yǔ)

      a. We should respect the old and love the young.

      b. The new will replace the old.

c. The rich and the poor live in separate sections in London.

試題詳情

3.作補(bǔ)語(yǔ)(賓語(yǔ)補(bǔ)足語(yǔ)或主語(yǔ)補(bǔ)足語(yǔ)):

      a. The news made her happy.

      b. We found the text very difficult.

      c. You should keep your classroom clean.

      d. The classroom should be kept clean.

試題詳情

2.作表語(yǔ):

      a. The bridge is long and wide.

b. It is getting warm.

試題詳情

1.作定語(yǔ):

      a. He is a great writer.

      b. This is an interesting book.

      c. I have something important to tell you.

試題詳情

8.如圖所示,L是電感足夠大的線圈,其直流電阻可忽略不計(jì),D1和D2是兩個(gè)相同的燈泡,若將電鍵S閉合,等燈泡亮度穩(wěn)定后,再斷開(kāi)電鍵S,則  (   )

A.電鍵S閉合時(shí),燈泡D1、D2同時(shí)亮,然后D1會(huì)變暗直到不亮,D2更亮

B.電鍵S閉合時(shí),燈泡D1很亮,D2逐漸變亮,最后一樣亮

C.電鍵S斷開(kāi)時(shí),燈泡D2隨之熄滅,而D1會(huì)亮一下后才熄滅

D.電鍵S斷開(kāi)時(shí),燈泡D1隨之熄滅,而D2會(huì)更亮后一下才熄滅

試題詳情

7.如圖所示電路中,A1、A2是兩只相同的電流表,電感線圈L的直流電阻與電阻R阻值相等.下面判斷正確的是  (   )

A.開(kāi)關(guān)S接通的瞬間,電流表A1的讀數(shù)大于A2的讀數(shù)

B.開(kāi)關(guān)S接通的瞬間,電流表A1的讀數(shù)小于A2的讀數(shù)

C.開(kāi)關(guān)S接通電路穩(wěn)定后再斷開(kāi)的瞬間,電流表A1的讀數(shù)大于A2的讀數(shù)

D.開(kāi)關(guān)S接通電路穩(wěn)定后再斷開(kāi)的瞬間,電流表A­1數(shù)等于A2的讀數(shù) 

試題詳情

6.如圖所示的電路中,燈泡A1、A2的規(guī)格完全相同,自感線圈L的電阻可以忽略,下列說(shuō)法中正確的是  (   )

A.當(dāng)接通電路時(shí),A2先亮,A1后亮,最后A2比A1亮

B.當(dāng)接通電路時(shí),A1和A2始終一樣亮

C.當(dāng)斷開(kāi)電路時(shí),A1和A2都過(guò)一會(huì)兒熄滅

D.當(dāng)斷開(kāi)電路時(shí),A2立即熄滅,A1過(guò)一會(huì)兒熄滅

試題詳情

5.如圖所示是一演示實(shí)驗(yàn)的電路圖。圖中L是一帶鐵芯的線圈,A是一燈泡。起初,開(kāi)關(guān)處于閉合狀態(tài),電路是接通的,F(xiàn)將開(kāi)關(guān)斷開(kāi),則在開(kāi)關(guān)斷開(kāi)的瞬間,通過(guò)燈泡A的電流方向是從_____端經(jīng)燈泡到_____端.這個(gè)實(shí)驗(yàn)是用來(lái)演示_____現(xiàn)象的。

試題詳情

4.如圖所示,L為一個(gè)自感系數(shù)大的自感線圈,開(kāi)關(guān)閉合后,小燈能正常發(fā)光,那么閉合開(kāi)關(guān)和斷開(kāi)開(kāi)關(guān)的瞬間,能觀察到的現(xiàn)象分別是  (   )

A.小燈逐漸變亮,小燈立即熄滅

B.小燈立即亮,小燈立即熄滅

C.小燈逐漸變亮,小燈比原來(lái)更亮一下再慢慢熄滅

D.小燈立即亮,小燈比原來(lái)更亮一下再慢慢熄滅

試題詳情

3.磁通量的單位是_____,磁感強(qiáng)度的單位是_____,自感系數(shù)的單位是_____。

試題詳情


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