皮皮学，免费搜题
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搜题
【单选题】
萎缩性鼻炎时,可用下列哪种药液滴鼻?A.
３％酚甘油
B.
４％硼酸洒精
C.
１‰肾上腺素
D.
３％双氧水
E.
复方薄荷脑油
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】若直线l的方向向量为（4，2，m），平面α的法向量为（2，1，-1），且l⊥α，则m=______．
【单选题】What is the major difference between B2B and B2C e-commerce?
A.
Customers interact freely in a B2B marketplace; they do not in a B2C marketplace.
B.
Consumers are fickle in a B2B marketplace; long time relationships are established between the consumer and its business partner in B2C e-commerce.
C.
Interaction between consumers and businesses are direct in the B2B market; they are indirect in the B2C market.
D.
The B2B marketplace does not involve consumers, just business partners; the B2C marketplace involves consumers.
【单选题】What is the text talking about?
A.
What the difference are between water and other drinks.
B.
What is human body made of.
C.
Water is the best drink.
【简答题】已知l ∥ α，且l的方向向量为（2，-8，1），平面α的法向量为（1，y，2），则y=______．
【单选题】What is the difference between velocity and speed?
A.
There is no difference, they are both vectors.
B.
Speed is a scalar and velocity is a vector.
C.
Speed is a vector and velocity is a scalar.
D.
There is no difference, they are both scalars.
【单选题】According to the video, what is difference between a good product and a great product?
A.
price
B.
producer
C.
advertisement
D.
attention to detail
【简答题】已知l∥α,且l的方向向量为u=(2,m,1),平面α的法向量为v=(1, ,2),则m=____.
【简答题】若l的方向向量为（2，1，m），平面α的法向量为（1， 1 2 ，2），且l⊥α，则m=______．
【简答题】已知l ∥ α，且l的方向向量为（2，m，1），平面α的法向量为 (1， 1 2 ，2) ，则m=______．
【简答题】What is the difference between B2B and B2C?
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