汽油机的 冲程将内能转化为机械能，如一台汽油机的输出功率是30kW，工作20min后，共输出机械能 J。
做功，3.6×107
根据句义和所给的首字母完成下列单词。
1. — Where is the bed?
— It's in your b______?
2. — Where is the picture?
— It's a______ the bed.
3. — Where are my shoes?
— They're b______ the bed.
4. — Where is the lamp?
— It's b______ the bed.
5. — Where are my pencils?
— They're i______ your pencil case.
对于中学生来说，自觉承担社会责任表现在[ ]
A、自己的事情自己做
B、不做法律禁止的事
C、积极参加公益活动
D、及时纠正自身过失
