【題目】世界每年因銹蝕而損失的金屬數(shù)量巨大,防止金屬銹蝕已成為科學(xué)研究中的重大問題.下列有關(guān)金屬銹蝕與保護措施的說法不正確的是(

A.鐵銹蝕的實質(zhì)是鐵與空氣中的氧氣、水蒸氣等發(fā)生了化學(xué)反應(yīng)

B.同樣的鐵制品在海南比在蘭州更易銹蝕

C.在鐵表面刷漆可以防止鐵銹蝕

D.鋁的抗銹蝕性能比鐵強,生活中可用鋼絲球洗刷鋁鍋

【答案】D

【解析】鐵與氧氣、水同時接觸,才能生成鐵銹,因此A正確.海南的空氣濕度比甘肅蘭州大,在這種環(huán)境下鐵制品更易被腐蝕,因此B正確.在鐵制品表面刷漆可以起到防銹的作用,因此C正確.鋁的抗銹蝕性能比鐵強,是因為常溫下鋁制品表面可形成一層致密的氧化物薄膜,如果用鋼絲球洗刷鋁鍋,會破壞其表面的氧化物薄膜,因此D錯誤.

練習(xí)冊系列答案
相關(guān)習(xí)題

科目:初中地理 來源: 題型:

【題目】實驗測得某物質(zhì)中只含有碳元素,則這種物質(zhì)( )

A.一定是金剛石或石墨中的一種

B.一定是木炭或活性炭中的一種

C.一定是碳元素的一種單質(zhì)

D.可能是一種碳單質(zhì),也可能是幾種碳單質(zhì)組成的混合物

查看答案和解析>>

科目:初中地理 來源: 題型:

【題目】下列常見的鹽在生產(chǎn)、生活中的用途不合理的是( )。

A.用亞硝酸鈉腌制食品

B.碳酸鈉廣泛應(yīng)用于玻璃、造紙、紡織和洗滌劑的生產(chǎn)

C.用純堿消耗面粉發(fā)酵生成的酸

D.天安門前的華表是用大理石做的,碳酸鈣還可用作補鈣劑

查看答案和解析>>

科目:初中地理 來源: 題型:

【題目】I want __________ to the supermarket with my sister this afternoon.

A. go B. to go C. going D. goes

查看答案和解析>>

科目:初中地理 來源: 題型:

【題目】下列說法不正確的是

A.回收一個鋁飲料罐比制造一個新飲料罐要貴

B.回收鋁飲料罐可以節(jié)約金屬資源

C.回收鋁飲料罐可以節(jié)約能源

D.回收鋁飲料罐可以減少對環(huán)境的污染

查看答案和解析>>

科目:初中地理 來源: 題型:

【題目】B

Winter Sale!

Winter is coming. So we are having a big and endofautumn sale. Look at the prices!

A blouse:$5

A coat:$20

A silk(絲綢) skirt:$28

A pair of trainers:$30

A pair of jeans:$30

Will you come to Reborn Fashion Shop on the 2nd floor of New Century Shopping Mall between Friday and Sunday?

Cash Back!

Spend twenty dollars in our shop, and we will give you five dollars back. Spend 40 dollars, and you will get 10 dollars back.

Remember:only at weekends

You are welcome to Happy Times Doll Shop on the first floor of New Century Shopping Mall.

Closing Down Sale!

Come to our shop next Monday. There is a discount(打折) on every kind of chocolate. And we will give you a big box of sweets for free(免費的) if you spend more than 20 dollars in our shop. So come to Sweetheart Chocolate Shop on the first floor of New Century Shopping Mall.

1 How many shops are there in this advertisement(廣告)?

A. Six. B. Four. C. Three. D. Two.

2 What is the price of a silk skirt in Reborn Fashion Shop?

A. $ 5. B. $ 20. C. $ 28. D. $ 30.

3If(如果) you spend 20 dollars in Happy Times Doll Shop, how much will you get back?

A. 5 dollars. B. 15 dollars.

C. 20 dollars. D. 40 dollars.

4If you want to buy clothes at a lower price, where should you go?

A. Happy Times Doll Shop.

B. Reborn Fashion Shop.

C. Sweetheart Chocolate Shop.

D. The first floor of New Century Shopping Mall.

5What does the underlined word mean in Chinese?

A. 商品 B. 發(fā)票 C. 贈品 D. 現(xiàn)金

查看答案和解析>>

科目:初中地理 來源: 題型:

【題目】為預(yù)防自行車生銹,下列做法中不合理的是(

A.車架表面噴涂油漆

B.鋼圈表面鍍防護金屬

C.鏈條表面涂機油

D.露天放置,日曬雨淋

查看答案和解析>>

科目:初中地理 來源: 題型:

【題目】 Eddie eats __________ food every day. Hobo thinks he needs some __________.

A. too much; exercises B. too many; exercises

C. too many; exercise D. too much; exercise

查看答案和解析>>

科目:初中地理 來源: 題型:

【題目】 Miss Fang is __________ English teacher. __________ is a good teacher.

A. our; Her B. my; He

C. mine; She D. my; She

查看答案和解析>>

同步練習(xí)冊答案