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【简答题】
在空间解析几何中,方程z^2-y^2=1表示一个________(填曲面类型),其母线平行于______轴(填x,y,z), 准线为一条在______面(填xoy,yoz,xoz)上的_______(填椭圆、双曲线、抛物线).
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举一反三
【单选题】Herman's success is due to his hard work and his ability to _______ plans which will get work done efficiently.
A.
undertake
B.
conduct
C.
formulate
D.
approve
【单选题】________ Pierre began to help his father with the farm work when he was
A.
In 1980’s; his teens
B.
At the 1980’s; the teens
C.
In the 1980s; in his teens
D.
In 1980’s; in the teens
【单选题】Heman’s success is due to his hard work and his ability to formulate plans which will get work done efficiently．
A.
fulfill
B.
approve
C.
conceive
D.
conduct
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