发电机既发有功功率又发无功功率。所以通常说的发电机容量是指发电机的全功率。
参考答案：错
Tom likes playing ________ volleyball, but Lily likes playing ________ piano.
A．a, a
B．the, the
C．the, /
D．/, the
爷爷到银行存、取款时，填写的单据需要长期保存，书写时必须用 [ ]
A．铅笔
B．圆珠笔
C．红墨水笔
D．碳素墨水笔
