1. Be _____ to your teacher. Keep silent when he tells you to do so. (A) respect (B) respected (C) respectful (D) respectable (E) respective

1. Be _____ to your teacher. Keep silent when he tells you to do so.
(A) respect
(B) respected
(C) respectful
(D) respectable
(E) respective

答案：登入後查看
統計： A(6), B(6), C(34), D(1), E(7) #2704249

詳解 (共 1 筆)

nomi

B1 · 2021/05/12

#4716152

Be respectful to you...

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12. 若 450 keV 的單能γ光子被效率為 11.5%的無機閃爍偵檢器之 NaI(Tl)晶體吸收，產生閃爍光子的平均能量為 2.5 eV，其中 70%的閃爍光子到達光電倍增管的陰極，該陰極把 30%的入射光子轉換成光電子。則平均每個被吸收的單能γ光子所產生的光電子數目為？ (A) 4.3 ✖ 103 (B) 2.1 ✖ 10 4 (C) 2.7 ✖ 104 (D) 4.8 ✖ 10 4

1. Be _____ to your teacher. Keep silent when he tells you to do so. (A) respect (B) respected (C) respectful (D) respectable (E) respective

詳解 (共 1 筆)

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1. Be _____ to your teacher. Keep silent when he tells you to do so.
(A) respect
(B) respected
(C) respectful
(D) respectable
(E) respective