皮皮学，免费搜题
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【单选题】
流行性腮腺炎的潜伏期平均为A.
6天
B.
9天
C.
12天
D.
15天
E.
18天
拍照语音搜题，微信中搜索"皮皮学"使用
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举一反三
【单选题】______ he once felt like giving up， he now has the determination to push further and keep on going.
A.
Where
B.
As
C.
In case
D.
New that
【简答题】已知| a |=1,| b |=2 , 向量 a 与向量 b 的方向相同,则 a · b =
【单选题】The same factors push wages and prices up together, the one ______ the other.
A.
emphasizing
B.
reinforcing
C.
multiplying
D.
increasing
【简答题】已知 a =(-2，2)， b =(3，1) ，则与 a +2 b 同向的单位向量为______．
【简答题】The same factors push wages and prices up together, the one ________ the other. A) emphasizing B) reinforcing C) multiplying D) increasing
【简答题】已知a={-1,2,-2},则与a同向的单位向量是( )
【简答题】句型转换。 l. There is a push-pin. It is holding up this piece of paper. (合并为一句) There is a push-pin_____ _____ this piece of paper. 2. He has a factory. It has a hundred machines. (合并为一句) He has a factory...
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