Which of the following choices is closest in meaning to the underlined word in the sentence: At age seventeen, she stepped aside, joined the board, and handed over the reins to two fifteen year olds.

用电负载大多呈感性（R+jωL），为提高功率因数，应使用（ ）方法提高功率因数。A、串联电容B、串联电阻C、并...

单项选择题用电负载大多呈感性（R+jωL），为提高功率因数，应使用（ ）方法提高功率因数。

He is interested in wildlife _________.

未知题型He is interested in wildlife _________.

形式主义学派的代表人物是德国数学家________。A、希尔伯特B、哥德尔C、康托尔D、哈肯

单项选择题形式主义学派的代表人物是德国数学家________。