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Câu hỏi:
What must be done to release the internal stresses that build up in glass products during manufacture?
- A. The glass must be reheated and evenly cooled.
- B. The glass must be cooled quickly.
- C. The glass must be kept moist until cooled.
- D. The glass must be shaped to its desired form immediately.
Lời giải tham khảo:
Đáp án đúng: A
Đáp án A
Điều gì phải làm để giảm áp lực bên trong các sản phẩm thủy tinh trong quá trình sản xuất?
A. Thủy tinh phải được hâm nóng và làm lạnh đều.
B. Thủy tinh phải được làm lạnh nhanh.
C. Thủy tinh phải được giữ ẩm cho đến khi nguội.
D. Thủy tinh phải được định hình theo hình thức mong muốn của nó ngay lập tức.
Dẫn chứng: “glassware must be slowly reheated and uniformly cooled after manufacture to release internal stresses induced by uneven cooling...” (thủy tinh phải được làm nóng lạ từ từ và làm lạnh đồng bộ...)
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