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【判断题】
二元函数对某个自变量的 偏导数 表示当其中一个自变量固定时,因变量对另一个自变量的 变化率 。根据一元函数微分学中 增量 与微分的关系,可得 , 。 上面两式左端分别称为二元函数对 和对 的 偏增量 ,而右端分别称为二元函数对 和对 的 偏微分 。A.
正确
B.
错误
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举一反三
【简答题】质量为 m 的粒子在长度为 l 的一维势箱中运动,基态时粒子的能量为 E 1 ,当粒子处在 的状态时,测量粒子的能量为 E 1 的几率为多少? ( )。
【单选题】When the giant went to the mountains one day, the children went into his garden.
A.
真
B.
False
【简答题】Directions: Match the former part of each sentences to the latter part, so as to form a whole sentence. . ( ) 1. I received the same grade ( ) 2. As I was exhausted, ( ) 3. As we know, ( ) 4. Things a...
【单选题】______ the day went on, we became closer and closer to each other. [ ]
A.
As
B.
With
C.
When
D.
While
【单选题】________the day went on, the weather turned out to be fine.
A.
Which
B.
Since
C.
While
D.
As
【简答题】子叶出土的棉花和大豆幼苗，在种子萌发形成幼苗的过程中，子叶之所以能推出土面，是由于_______伸长的结果。
【单选题】The children went home from the grammar school,their lessons ___ for the day.
A.
finishing
B.
finished
C.
had finished
D.
were finished
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