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【单选题】
材料从采购、运输到保管,在使用前所发生的全部费用构成了材料预算价格,它由材料的( )价格组成。 A .供应价 B .运杂费 C .运输损耗费 D .采购及保管费 E .检验试验费A.
B.
C.
D.
D
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【单选题】Mathematica软件中,求解微分方程 的命令为( )。
A.
DSolve[y''+4y'+5y==0,y,x]
B.
DSolve[y''[x]+4y'[x]+5y[x]==0,y[x],x]
C.
Dsolve[y''[x]+4y'[x]+5y[x]==0,y[x],x]
D.
Dsolve[y''+4y'+5y==0,y,x]
【单选题】I can't read tile sign on the door. Please hold ______.
A.
the light a little closer to it
B.
the light to it a little closer
C.
to it the light a little closer
D.
a little closer the light to it
【单选题】Mathematica软件中,求解微分方程 , 的命令为( )。
A.
Dsolve[{y'-1-y^2==0,y-1==0},y,x]
B.
DSolve[{y'[x]-1-y[x]^2==0,y[0]-1==0},y[x],x]
C.
DSolve[{y'-1-y^2==0,y-1==0},y[x],x]
D.
Dsolve[{y'[x]-1-y[x]^2==0,y[0]-1==0},y,x]
【单选题】What does “door closer” in the title mean?
A.
a device on a door
B.
people who let unnecessary options go
C.
a lock
D.
people who shut the door
【单选题】I can't read the sign on the door. Please hold______.
A.
the light a little closer to it
B.
the light to it a little closer
C.
to it the light a little closer
D.
a little closer the light to it
【简答题】Don't be too willing to to believe! If he intended to give you the job, he would have called you by now.
【简答题】（2011江苏徐州，22,6分）徐州至上海的铁路里程为650km。从徐州乘“G”字头列车A、“D” 字头列车B都可直达上海，已知A车的平均速度为B车的2倍，且行驶的时间比B车少2.5h. （1）设B车的平均速度为x kn／h，根据题意，可列分式方程： ▲ ； （2）求A车的平均速度及行驶时间.
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