单项选择题
茄子一般采用（ ）方法嫁接 A.
劈接法 B.
插接法 C.
靠接法 D.
贴接法
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单项选择题
在维新运动期间，哪个省被史家称为“全国最有生气的省份”（ ） A. 广东 B. 湖北 C. 山东 D. 湖南 -
单项选择题
建成以来，该桥经受了多次洪水和地震，但其主体结构仍然完好无损，至今仍在使用。 Since the completion, the bridge has withstood floods and earthquakes, but remains intact in its main structure and still available in use. Since the bridge was completed, the bridge has withstood floods and earthquakes, but its main structure remains intact, used until now. The first English sentence is a better translation. A、正确 B、错误 -
问答题
单相全桥逆变电路移相调压方式的工作原理？
