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【多选题】
GP88s对讲机天线开关电路由（ ）组成
A.
两只PIN二极管（ CR101和CR102）
B.
一个π型网络（C107、L104和106 ）
C.
两只DIN二极管（ CR103和CR104）
D.
一个U型网络（C108、L108和105 ）
参考答案：
参考解析：
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举一反三
【单选题】According to a survey, which was based on the responses of over 188,000 students, today"s traditional-age college freshmen are "more materialistic and less altruistic (利他主义的 )" than at any time in the...
A.
have never been so materialistic as today
B.
have never been so interested in the arts
C.
have never been so financially well off as today
D.
have never attached so much importance to moral sense