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【单选题】
设f(x)=2x+3x-2,则当x→0时,[ ].
A.
f(x)与x是等价无穷小量
B.
f(x)与x是同阶非等价无穷小量
C.
f(x)是比x较的无穷小量
D.
f(x)是比x较低阶的无穷小量
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皮皮学刷刷变学霸
举一反三
【多选题】《伤寒解惑论》的学术特色主要有
A.
传授方法
B.
创新学术
C.
结合案例
D.
随证治之
【单选题】哪个是氯霉素具抗菌活性的构型
A.
1S, 2S
B.
1S, 2R
C.
1R, 2R
D.
2S, 2R
【单选题】石英的三种高温形变体,之所以晶型转变困难,主要原因在于硅氧四面体的连接方式不一样,其中在 α- 方石英中,共顶连接的两个硅氧四面体的连接方式为( )
A.
以共顶的氧作为对称中心
B.
在共顶的氧离子处存在对称面
C.
Si-O-Si键角为150°
D.
Si-O-Si键角为137°
【简答题】完形填空。 Peter has a sister 1 a brother. His sister's name is Lisa. His brother's name is Nick. Lisa 2 music.She can 3 very well. She wants 4 the music club. Peter and Nick can play soccer, but they can'...
【单选题】Lisa said that she married him because she was completely ______ by his manners.
A.
held in
B.
brought in
C.
lain in
D.
taken in
【单选题】燃料电池按 燃料 使用类型分为( )大类。
A.
5
B.
4
C.
3
D.
2
【单选题】哪个是氯霉素具抗菌活性的构型
A.
1S, 2S
B.
1S, 2R
C.
1R, 2R
D.
2S, 2R
E.
2R, 3R
【简答题】用单词正确形式填空 1. This is _____(I )sister. 2. These _______(be) Gina and Lisa. 3. These are his ______(friend). 4. Are these her _______(cousin)? 5. John ______(be) her son.
【单选题】燃料电池按燃料使用类型分为( )大类。
A.
2
B.
3
C.
4
D.
5
【单选题】What has Jeremiah Spears learned from his friend Lisa?
A.
To put away a part of the money he receives.
B.
To buy what he needs first.
C.
To list his shopping items.
D.
To make a chart of his wants.
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