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【单选题】
一学生用100 N的质量为0.5 kg的球以8 m/s的初速度沿水平方向踢出20 m远,则学生对球做的功为( )A.
2000J
B.
16J
C.
1000J
D.
无法确定
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反馈参考答案：
举一反三
【单选题】According to the passage, what is the best for both parents and children?
A.
They should adjust themselves to sharing the family expenses.
B.
Children should leave their parents when they are grown up.
C.
Adult children should visit their parents from time to time.
D.
Parents should support their children when they are in trouble.
【单选题】Why didn't you write down what the teacher has said? You cannot just _____your memory.
A.
reiy on
B.
account for
C.
believe in
D.
base on
【判断题】如点火提前角过大,混合气的燃烧在压缩行程中进行,气缸内的燃烧气体压力急剧上升,会给正在上行的活塞造成一短时间的巨大阻力,使发动机功率上升,而且爆燃严重。
A.
正确
B.
错误
【判断题】如点火提前角过大，混合气的燃烧在压缩行程中进行，气缸内的燃烧气体压力急剧上升，而且会产生较大的爆燃声音，会给正在上行的活塞造成一短时间的巨大推力，使发动机功率上升。
A.
正确
B.
错误
【单选题】以下关于人际沟通概念的描述中不去正确的是
A.
沟通是双向理解的过程
B.
沟通意义在于积极有效
C.
沟通是一个双向、互动的过程
D.
沟通是信息的传递、感情的交流
E.
沟通的目的是达到准确理解彼此信息的含义
【判断题】如点火提前角过大,混合气的燃烧在压缩行程中进行,气缸内的燃烧气体压力急剧上升,而且会产生较大的爆燃声音,会给正在上行的活塞造成一短时间的巨大推力,使发动机功率上升。2
A.
正确
B.
错误
【单选题】According to the passage what is the best for both parents and children?
A.
They should adjust themselves to sharing the family expenses.
B.
Children. should leave their parents when they are grown up.
C.
Adult children should visit their parents from time to time.
D.
Parents should support their adult children when they are in trouble.
【单选题】Which of the following cannot explain why cash is critical to the health of an underground economy?
A.
Cash is anonymous.
B.
Cash is hardly traceable.
C.
Cash is easily stolen.
D.
Cash is the lifeblood of the black market.
【判断题】如点火提前角过大,混合气的燃烧在压缩行程中进行,气缸内的燃烧气体压力急剧上升,会给正在上行的活塞造成一短时间的增力,使发动机功率上升,而且爆燃严重。
A.
正确
B.
错误
相关题目：
【判断题】如点火提前角过大,混合气的燃烧在压缩行程中进行,气缸内的燃烧气体压力急剧上升,而且会产生较大的爆燃声音,会给正在上行的活塞造成一短时间的巨大推力,使发动机功率上升。2
A.
正确
B.
错误
参考解析：
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