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【多选题】
关于采用热平衡法建立节点离散方程的说法,正确的有( )。A.
热平衡法的依据就是能量守恒原理和叶定律
B.
假定各项导热量进入的方向都应该要一致，其代数和为零
C.
适用于所有类型的节点
D.
当导热系数等物性是温度的函数或内热源不是均匀分布等情形时不适用
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【简答题】用所给单词的适当形式填空。 1. It is raining ______ (heavy), I couldn't go out. 2. We enjoyed ______ (oneself) last Sunday. 3. We are excited ______ (see) each other. 4. The old man is very ______ (friend) to me. 5...
【简答题】控制系统如图所示: 阶跃响应为: 试利用系统辨识法确定系统数学模型。
【单选题】Read the passage and choose the correct ones.I've got a brother who is two years older than I am. Sometimes he's OK but other times he is a real pain in the neck. I'll give you some examples. Yesterda...
A.
The writer likes the friend.
B.
The friend wants to help with more than the math homework.
C.
The writer only wants the fiend to help with the math homework.
D.
The writer likes the friends.
【简答题】如图所示控制系统: 其阶跃响应曲线为: 试利用过程特性测试建模法确定系统数学模型。
【单选题】BL Lac天体的主要特点是( )。
A.
有非常强烈的射电波发射
B.
有射电—X辐射,极亮核,明线光谱
C.
星系中心部分有大量的物质喷发出来
D.
亮度无规则变化,没有光谱线,有射电—X辐射
【简答题】用适当的并列连词填空 1. He couldn't know the truth about me,_____ he wouldn't treat me like this. 2. The bell is ringing _____the lesson is over. 3. Although he was ill,_____he kept on working. 4. I can't ma...
【简答题】影响发动机点火提前角的主要因素有（）和负荷
【简答题】It was a quiet village in which there was a military( 的 ) camp. It was far from the towns and cities and there were some high mountains around. Of course it was a good place for training the new sol...
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