太阳能热水器是直接利用太阳能给水加热的装置，下表是小明家的太_爱下问搜题

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问题计算题

太阳能热水器是直接利用太阳能给水加热的装置，下表是小明家的太阳能热水器某天在阳光照射下的相关信息

其中太阳辐射功率是指1h内投射到1m²面积上的太阳能．求：

（1）水在10h内吸收的热量；

（2）如果水吸收的热量用天然气来提供，需要完全燃烧多少m³的天然气；（天然气的热值为8.4×10⁷J／m³，天然气完全燃烧放出的热量全部给水吸收）

（3）该太阳能热水器的能量转化效率．

答案

解：

（1）Q=cm△t==4.2×10³J/（kg·℃）×100kg×500C=2.1×10⁷J；

（2）Q=qV，2.1×10⁷J=8.4×10⁷J/m3×V，V=0.25m³；

（3）Q'= 1.68×10⁶×2.5×10J=4.2×10⁷J，。

完形填空

It was silent in Mom’s hospital room. Only the sound of her heart monitor interrupted the     moments of what seemed to be a peaceful sleep. It had been several hours since her operation. I wanted her to wake up. I needed to     to her. Last night, I shouted at her because she had allowed my     sister to visit her when she had     our mom for years.
“Shame on you!” she had said firmly. “Moms don’t stop     their children just because one of them chose to leave her. A mother always loves more than she’s loved     .”
I thought, “Shame on you! When I do something wrong or when a friend is     to her, that’s all she will ever say. How about standing up for you     for once, Mom?”
My mom’s groaning（呻吟）broke my     . she couldn’t speak,     her eyes were moving, looking for something. She     her notebook and pen next to her bed. I gently handed them to her. She     slowly, and then turned the notebook around for me to read.
“I forgive you,” it     .
Tears ran down my face. I felt     . As I began to speak, I was     by the loud arguing of two seemingly angry nurses on the opposite side of the room. My mom suddenly began writing on her notebook, and then stopped to      the piece of paper. She handed it to me, signaling me to give it to the nurses. They read it, looked      at my mom and quietly left the room.
“What did you write, Mom?” I asked.
She smiled sweetly but said nothing.     , I knew what she had written on that piece of paper. How     those three little words are!
I kissed my mom goodbye and     to find my sister.

D．concentration

C．looked through

D．reached for

D．interrupted

填空题

数据结构包括数据的（）、数据的（）和数据的（）这三个方面的内容。