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【简答题】
2005年10月12日，我国成功发射了“神州”六号载人飞船，这标志着中国人民又迈出了具有历史意义的一步．已知火箭的起飞重量M是箭体（包括搭载的飞行器）的重量m和燃料重量x之和．在不考虑空气阻力的条件下，假设火箭的最大速度y关于x的函数关系式为： y=k[ln(m+x)-ln( 2 m)]+4ln2(其中k≠0) ．当燃料重量为 ( e -1)m 吨（e为自然对数的底数，e≈2.72）时，该火箭的最大速度为4（km/s）． （1）求火箭的最大速度y（km/s）与燃料重量x吨之间的函数关系式y=f（x）； （2）已知该火箭的起飞重量是544吨，是应装载多少吨燃料，使该火箭的最大飞行速度达到8km/s，顺利地把飞船发送到预定的轨道？
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举一反三
【多选题】what are the three main types of Chinese Painting?
A.
birds and flowers
B.
Chinese landscape figure
C.
painting
【单选题】About Chinese traditional painting, which of the following is NOT true?
A.
The characteristics of Chinese painting are closely related to the nature of the medium.
B.
Chinese painting is inseparably associated with literature and other arts such as poetry and calligraphy.
C.
The likeness in Chinese paintings was achieved in much the same way as Western paintings.
D.
Chinese painting is symbolic, for everything that is painted reflects some aspect of totality of symbols of a more specific kind.
【单选题】About Chinese traditional painting, which of the following is NOT true?
A.
The characteristics of Chinese painting are closely related to the nature of the medium.
B.
The likeness in Chinese paintings was achieved in much the same way as Western paintings.
C.
Chinese painting is inseparably associated with literature and other arts such as poetry and calligraphy.
D.
Chinese painting is symbolic, for everything that is painted reflects some aspect of totality of symbols of a more specific kind.
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