cuộc sống của nhân dân ta dưới ách đô hộ của nhà Hán như thế nào

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Tại sao lại đặt vấn đề bảo vệ rừng A MA Dôn

Một tia sáng đi từ môi trường không khí vào môi trường thuỷ tinh ( có chiết suất bằng √2) khi tăng dần góc tới thì góc khúc xạ: A. Tăng dần và đạt giá trị giới hạn bằng 90° B. Giảm dần và đạt giá trị giới hạn bằng 90° C. Giảm dần và đạt giá trị giới hạn bằng 45° D. Tăng dần và đạt giá trị giới hạn bằng 45°

135.Nearly all speed reading courses have a “pacing element”. This timing device lets the students know how many words a minute they are reading.  A. Nearly all speed reading courses have a “pacing element” which is a timing device lets the students know how many words a minute they are reading.  B. Nearly all speed reading courses have a "pacing element” which is a timing device that lets the students know how many words a minute they are reading.  C. Nearly all speed reading courses have a "pacing element", a timing device that lets the students know how many words a minute they are reading.   D. Nearly all speed reading courses have a "pacing element", that is a timing device that lets the students know how many words a minute they are reading. 136. Now go back and read them at what you feel to be your normal w.p.m rate. You can comfortably understand at this rate.  A. Now go back and read them at what you feel to be your normal w.p.m rate, the rate which you can comfortably understand.  B. Now go back and read them at what you feel to be your normal w.p. m rate the rate at which you can comfortably understand.   C. Now go back and read them at what you feel to be your normal w.p.m rate, the rate which you can comfortably understand at. D. B and C are correct.  137. Some students prefer a strict teacher. This teacher tells them exactly what to do. A. Some students prefer a strict teacher, who tells them exactly what to do.  B. Some students prefer a strict teacher who tells them exactly what to do.  C. Some students prefer a strict teacher, that tells them exactly what to do. D. All are correct.  138. Many devices offer apps. These apps use voice recognition technology A. Many devices offer apps whose use voice recognition technology.  B. Many devices offer apps, which use voice recognition technology.  C. Many devices offer apps which use voice recognition technology. D. Many devices offer apps in which use voice recognition technology.  139. This is my new tablet. It uses the latest digital technology. A. This is my new tablet that uses the latest digital technology.   B. This is my new tablet which uses the latest digital technology.  C. This is my new tablet, which uses the latest digital technology. D. This is my new tablet, that uses the latest digital technology.  140. Most children aged 5 to 11 in England go to primary schools. These schools are largely co-educational.  A. Most children aged 5 to 11 in England go to primary schools, which are largely co-educational.  B. Most children aged 5 to 11 in England go to primary schools which are largely co-educational. C. Most children aged 5 to 11 in England go to primary schools that are largely co educational. D. Most children aged 5 to 11 in England go to primary schools where are largely co-educational.

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Câu 1 so sánh quy trình bảo quản củ giống và hạt giống Câu 2 mục đích và ý nghĩa của công tác chế biến nông lâm thủy sản

Câu 1:Vì sao người ta phải thu hoạch đỗ xanh va đỗ đen trước khi quả chín khô Câu 2:Vì sao người ta chỉ giữ lại làm giống các hạt to,chắt,mẩy ko bị xứt xẹo và ko bị sâu bậy Viết đầy đủ ko cần viết câu hỏi

Các anh chị giải cho em vs ạ......

neu ket luan ve su truyen tia sang tu khong khi sang nuoc.ve hinh minh hoa