21. 如右圖所示之差動放大器，若欲提高其共模拒斥比(CMRR)，可將電路中的射極電阻 RE 以下列何者取代最佳？ (A) 定電壓源 (B) 定電流源 (C) 定電感 (D) 定電容

5. Which of the following statements is true with respect to Belady's anomaly? (A) Giving more memory to a process will improve its performance. (B) As the number of allocated frames increases, the page-fault rate may decrease for all page replacement algorithms. (C) For some page replacement algorithms, the page-fault rate may increase as the number of allocated frames increases. (D) For some page replacement algorithms, the page-fault rate may decrease as the number of allocated frames increases.

21. 如右圖所示之差動放大器，若欲提高其共模拒斥比(CMRR)，可將電路中的射極電阻 R_E 以下列何者取代最佳？

(A) 定電壓源
(B) 定電流源
(C) 定電感
(D) 定電容

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