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【单选题】
(单选)在发生共晶转变L→α+β时,L、α、β三相的成分为。()A.
相同
B.
确定不变
C.
不断变化
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【简答题】如何识别水杉、池衫和落羽杉?
【单选题】关于功率,下列说法中正确的是
A.
功率是描述做功快慢的物理量，在国际单位制中，其单位是焦耳 (J)
B.
功率是描述做功快慢的物理量，在国际单位制中，其单位是瓦特 (W)
C.
功率是描述做功多少的物理量，在国际单位制中，其单位是焦耳 (J)
D.
功率是描述做功多少的物理量，在国际单位制中，其单位是瓦特 (W)
【简答题】Nick can't find his watch. It is blue. The watch is from his uncle Tom. His friend Eric likes it very much. Nick calls his father at 879-0949. He says, "Dad, I can't find my watch. Do you know where i...
【简答题】Dear Dad, I’m writing to you because it’s not easy to talk about it. I still 1 clearly how my uncle died two years ago. In fact, I seriously want to ask you to stop smoking. I’ve looked up a lot of in...
【单选题】关于功率 , 下列说法中正确的是
A.
功率大说明力做的功一定多
B.
功率小说明力做的功一定少
C.
由 P = W / t 可知机器做功越多 , 其功率越大
D.
单位时间内机器做功越多 , 其功率越大
【简答题】Jack is six. He is old enough to go to school. On the first day, his teacher teaches him three words,“l, you, he”.Then the teacher says, “I am your teacher. You are my student. He is your classmate.” ...
【简答题】阅读下面短文，掌握其大意，从A、B、C、D四个选项中选出最佳选项。 Dear Dad, I’m writing to you because it’s not easy to talk about it. I still 1 clearly how my uncle died two years ago. In fact, I seriously want to ask you to stop s...
【简答题】信息归纳。 Dear Dad and Mum, How are you? I hope you are well. I have been in Beijing for about two months and I enjoy living here very much. The weather here is pretty cold and people are friendly. I work...
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