【单选题】.北魏时期( ) 编写的《齐民要术》,是中国现存最早、最完备的农书。
【多选题】在城市轨道交通中,基于通信的列车控制系统CBTC是一种采用( )相结合的列车控制系统。
【简答题】“事父母能竭其力,事君能致其身”出自()。
【单选题】北魏时期( )编写的《齐民要术》,是中国现存最早、最完备的农书。
【单选题】北魏时期( )编写的《齐民要术》,是中国现存最早、最完备的农书。
【单选题】Which of the following statements is NOT mentioned in the passage?
A.
It is generally believed that the year 1500 can be set as the beginnIng of the modem English language.
B.
Other languages had great influence on the English language at different stages of its development.
C.
The English language has beech and still in a state of relatively constant change.
D.
Many classes Or groups have contributed to the development of the English language.
【单选题】北魏时期()编写的《齐民要术》,是中国现存最早、最完备的农书。
【简答题】表示绕x轴旋转90度的四元数的值为: , ? 提示: 。