氦3是一种十分清洁、安全的能源，开发月壤中蕴藏丰富的氦3资源，对人类社会今后的可持续发展具有深远意义．研究发现在太阳内部两个氘核可聚变成氦3，已知氘核的质量为2.0136U，中子的质量为1.0087U， He核质量为3.0150U．若质量亏损1U释放的核能为=931.5MeV，则两个氘核聚变成 He核的核反应方程为____；上述反应中释放的核能为____．

根据句子意思，用括号中所给汉语提示或英语单词的适当形式填空。在答题卡标有题号的横线上，写出空缺处所填单词的正确形式。
⑴The ____ will drop below zero. (温度) 
⑵You should understand the____ of learning English well.(重要性)
⑶All of us know bad weather sometimes causes ____ disasters. (自然的)
⑷The ____ girl named Susanne in the world weighs nearly 700 kilograms now. （胖)
⑸Ladies and gentlemen, please let me ____  my best friend to you. (介绍)
⑹____ , he didn't hurt badly in the terrible accident. (lucky)
⑺The ____ are busy fishing in the lake. (fish)
⑻The shoes are ____  to wear, I will not buy them. (comfortable )
⑼Help ____ to some meat, boys and girls. (you)
⑽You had better____  at home until it stops raining. (stay)

在比例尺为1:100000的地图上,两地图上距离为3厘米,则实地距离是（   ）