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判断题
Because Chenxiang is bitter in flavor and heavy in texture, it tends to go downward within human bodies,so it has the efficacy of sending down the stomach qi and arresting vomiting and can be used to treat various nausea and vomiting.
答案：
正确
的单色光照射某种金属时，逸出光电子的最大动能为
；若改用频率为2
B. 
C. 
D. 
