Câu hỏi:

21/07/2024 435

Read the following passage and answer the questions

Ballpoint pen is a pen that has, as its name says, ball at its point which rotates when dragged across the writing surface and leaves behind ink that comes from the reservoir of the pen. Ball at the point can be of different diameter and can be made of brass, steel, or tungsten carbide. It is today the most widespread writing instrument and has literally changed the way we write.

   Trying to invent a pen which can write on leather, a tanner John J. Loud invented the first ballpoint pen and patented it in 1888 in America. This pen had a small steel ball which was placed so it could not fall out nor fall in but it still could rotate freely. This invention was not commercially viable and could not be used for writing. Because of that patent lapsed in time.

What can ball at the point be made of?

Trả lời:

verified Giải bởi Vietjack

Đáp án là: It can be made of brass, steel, or tungsten carbide.

CÂU HỎI HOT CÙNG CHỦ ĐỀ

Câu 1:

Choose the best answer A, B, C or D to complete the following sentences.

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Câu 3:

Give the correct form of the verbs in the blanket

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Choose the best answer A, B, C or D to complete the following sentences.

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Give the correct form of the verbs in the blanket

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Câu 6:

Complete the second sentence so that it has the same meaning to the first

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Their house________

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Give the correct form of the verbs in the blanket

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Complete the second sentence so that it has the same meaning to the first

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Complete the second sentence so that it has the same meaning to the first

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Choose the best answer A, B, C or D to complete the following sentences.

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Câu 11:

Complete the second sentence so that it has the same meaning to the first

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Choose the best answer A, B, C or D to complete the following sentences.

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Choose the best answer A, B, C or D to complete the following sentences.

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Câu 14:

Choose the best answer A, B, C or D to complete the following sentences.

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Câu 15:

Choose the best answer A, B, C or D to complete the following sentences.

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