句型转换。

1. Summer is the hottest season in China. (改为一般疑问句)

    _____ _____ the hottest season in China?

2. What was the weather like in your city? (改为同义句)

    _____ was the weather in your city?

3. My sister is talking on the phone. (对画线部分提问)

     ____ your sister _____?

4. She often plays soccer after school. (用now改写句子)

    She _____ _____ soccer now.

5. Today is sunny. (对画线部分提问)

    _____ _____  the weather today?

三相负载Y形连接时线电流等于（）。