Key words. (What words appear several times? List 5 more.)
Read the heading and the first sentence in each paragraph. What do you think the reading is probably about?_____________________________
根据8.2节的实验结果，说明Q1、Q0、CP0三者之间的频率关系：
A. Q1是CP0的四分频
B. Q0是CP0的四分频
C. Q1是Q0的二分频
D. Q0是CP0的二分频
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