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【判断题】
交—直—交变频器按中间回路对无功能量处理方式的不同可分为电压型、电抗型等。
A.
正确
B.
错误
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参考答案:
举一反三
【简答题】下面所列方程属于二阶齐次线性微分方程的是( ) (1) (2) (3) (4) (5) (6)
【单选题】He is short _____ short hair. [     ]
A.
in
B.
with
C.
from
D.
and
【简答题】阅读短文,在相应栏中打“√'。 My friend is Mike. He is a boy. He is tall and strong. He has short hair. He likes sports. Amy is my friend, too. She is a girl. She's short and thin. She has long hair. She likes pain...
【单选题】— What’s he _______? — He has short hair. [     ]
A.
do
B.
does
C.
like
【简答题】英译汉:He is in his fifties. He has short hair.
【简答题】读句子,画人物。 My friend is a boy. He's thin. He has short hair. He has a big nose and a big mouth. He has big eyes and ears.
【多选题】下列属于一阶线性齐次微分方程的是
A.
B.
C.
【多选题】下列微分方程属于齐次方程的是
A.
xy'=y(lnx-lny)
B.
xy'-y+siny/sinx
C.
y'=e^(x+y)
D.
(2x+3y)dx+(4x-5y)dy=0
【简答题】选择正确的译文。 1. 他梳着一头短发。 [     ] A. He has long hair. B. She has long hair. C. He has short hair. 2. 我的朋友喜欢运动。 [     ] A. My friend likes sports. B. My friend like sport. C. My likes sport. 3. 她有一对大耳朵。 [ ...
【多选题】下面所列方程属于二阶齐次线性微分方程的是( ) (1) (2) (3) (4) (5) (6)
A.
(1)
B.
(2)
C.
(3)
D.
(4)
E.
(5)
F.
(6)
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