4.作主語或賓語: 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, 在句中可以作主語或賓語
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.
3.作補(bǔ)語(賓語補(bǔ)足語或主語補(bǔ)足語):
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.
2.作表語:
a. The bridge is long and wide.
b. It is getting warm.
1.作定語:
a. He is a great writer.
b. This is an interesting book.
c. I have something important to tell you.
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是兩個相同的燈泡,若將電鍵S閉合,等燈泡亮度穩(wěn)定后,再斷開電鍵S,則 ( )
A.電鍵S閉合時,燈泡D1、D2同時亮,然后D1會變暗直到不亮,D2更亮
B.電鍵S閉合時,燈泡D1很亮,D2逐漸變亮,最后一樣亮
C.電鍵S斷開時,燈泡D2隨之熄滅,而D1會亮一下后才熄滅
D.電鍵S斷開時,燈泡D1隨之熄滅,而D2會更亮后一下才熄滅
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.開關(guān)S接通電路穩(wěn)定后再斷開的瞬間,電流表A1的讀數(shù)大于A2的讀數(shù)
D.開關(guān)S接通電路穩(wěn)定后再斷開的瞬間,電流表A1數(shù)等于A2的讀數(shù)
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,下列說法中正確的是 ( )
A.當(dāng)接通電路時,A2先亮,A1后亮,最后A2比A1亮
B.當(dāng)接通電路時,A1和A2始終一樣亮
C.當(dāng)斷開電路時,A1和A2都過一會兒熄滅
D.當(dāng)斷開電路時,A2立即熄滅,A1過一會兒熄滅
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,開關(guān)處于閉合狀態(tài),電路是接通的,F(xiàn)將開關(guān)斷開,則在開關(guān)斷開的瞬間,通過燈泡A的電流方向是從_____端經(jīng)燈泡到_____端.這個實(shí)驗(yàn)是用來演示_____現(xiàn)象的。
4.如圖所示,L為一個自感系數(shù)大的自感線圈,開關(guān)閉合后,小燈能正常發(fā)光,那么閉合開關(guān)和斷開開關(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,小燈比原來更亮一下再慢慢熄滅
D.小燈立即亮,小燈比原來更亮一下再慢慢熄滅
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_____。
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