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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】选择最佳答句 。 He short brown hair.
A.
have
B.
has
C.
is
【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】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.
【判断题】青少年时期,青少年与父母的亲密关系下降,与同伴的亲密关系提高。
A.
正确
B.
错误
【多选题】产生代谢性碱中毒的因素有
A.
有效循环血量减少
B.
缺氯
C.
低钾血症
D.
ADH增多
E.
醛固酮增多
【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)
【单选题】下列偏微分方程中,属于2阶、线性、非齐次的有( )
A.
B.
C.
D.
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