【題目】普通玻璃的主要成分是:Na2SiO3CaCO3;CaSiO3;SiO2;Na2CO3CaO(

A.①③⑥ B.②③④ C.①③④ D.③④⑤

【答案】C

【解析】制玻璃的原料是純堿、石灰石和石英,在高溫下反應(yīng)獲得玻璃,玻璃的主要成分是硅酸鈣、硅酸鈉和二氧化硅的混合物,答案選C。

練習(xí)冊系列答案
相關(guān)習(xí)題

科目:高中地理 來源: 題型:

【題目】下列物質(zhì)中含有氯分子的是

A.注射用KCl溶液 B.氯化鈉

C.液態(tài)氯化氫 D.液氯

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】耕地利用集約度是指在考慮耕地生態(tài)環(huán)境質(zhì)量的前提下,在一定時間內(nèi)投入到單位面積耕地上的勞動力、資金、物質(zhì)、技術(shù)等的密集程度及產(chǎn)出效益。讀四川省耕地利用集約度變化圖,回答下列問題。

1從1999~2007年,該省耕地利用集約度呈現(xiàn)總體趨勢是( )

A.波動上升的趨勢 B.一直上升

C. 時而上升,時而下降 D.上升趨勢不明顯

【2】該省今后要繼續(xù)提高耕地利用集約度,可采取的合理性措施是( )

A.大量使用農(nóng)藥和化肥

B.大量退耕還林還草

C.興修農(nóng)田水利工程

D.禁止農(nóng)村勞動力外出務(wù)工

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】讀我國某山地東坡和西坡年降水量隨高度變化示意圖,完成下題。

【1】該山地可能是

A.長白山 B.太行山 C.大興安嶺 D.雪峰山

【2】下列關(guān)于該山地年降水量的敘述,正確的是

A.東坡降水量平均變化速率小于西坡

B.東坡降水量隨高度的升高持續(xù)增加

C.東西降水量800米附近差異最大

D.西坡降水量隨高度的升高逐漸遞減

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】短文改錯(共10小題;每小題l分,滿分10分)

假定英語課上老師要求同桌之間交換修改作文,請你修改你同桌寫的以下作文。文中共有10處語言錯誤,每句中最多有兩處每處錯誤僅涉及一個單詞的增加、刪除或修改。

增加:在缺詞處加一個漏字符號(),并在其下面寫出該加的詞。

刪除:把多余的詞用斜線(\)劃掉。

修改:在錯的詞下畫一橫線,并在該詞下面寫出修改后的詞。

注意:

1. 每處錯誤及其修改均僅限一詞;

2. 只允許修改10處,多者(從第11處起)不計分。

One day a young man announces that he had the most beautiful heart. A large crowd both admired his heart for its perfection. A young man was very proud of it. Suddenly, an old man appeared and said, "Your heart is not nearly as beautifully as mine." The crowd or the young man looked at the old man’s heart. It was beaten strongly, but full of scars. The young man laughed and said, "You must joking." The old man said, "Yours is perfect but every scars represents a person to who I have given my love because they remind me of the love we shared. So now do you see what does true beauty is? "

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】The conference was held to discuss the effect that tourism has ______ the wildlife in the area.

A.in B. on

C.at D. with

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】An average of just 18.75cm of rain fell last year, making ___________ the driest year since California became a state in 1850.

A. each B. it C. this D. one

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】 短文改錯(共10小題;每小題l分,滿分10分)

假定英語課上老師要求同桌之間交換修改作文,請你修改你同桌寫的以下作文。文中共有10處語言錯誤,每句中最多有兩處。每處錯誤僅涉及一個單詞的增加、刪除或修改。

增加:在缺詞處加一個漏字符號(),并在其下面寫出該加的詞。

刪除:把多余的詞用斜線(\)劃掉。

修改:在錯的詞下畫一橫線,并在該詞下面寫出修改后的詞。

注意:

1. 每處錯誤及其修改均僅限一詞;

2. 只允許修改10處,多者(從第11處起)不計分。

My old classroom was interesting because three side of the classroom were made from glass. I enjoyed sit close to the windows and looking at the view. On the left-hand side of the class, I could easy see the football field. In the mornings, it was full of students exercising. The view from the back of the classroom is also splendid. Close to the school there was a beautiful park with many trees around them. Farther in the distance, I could not enjoy the view of snowy mountains. On the right side of the class was the road. I was always interested to see the drivers in hurry in the morning. The position of the classroom with its view made me felt like I was dreaming. If I was only a child when I studied in that classroom, I will never forget it.

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】 —— Can you shoot the bird at the top of the tree?

——No, it’s out of _________.

A. range B. reach C. control D. distance

查看答案和解析>>

同步練習(xí)冊答案