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【单选题】
属于非线性电阻元件的是
A.
白炽灯的钨丝
B.
二极管
C.
输电用的导线
D.
电机的铜芯线
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【简答题】Don'e be too ________! If the manager of the car dealership intended to give you the job, he would have called you by now.(gigantic; standpoint; evacuate; naïve; permeate; nutrition; inflict; stray; d...
【单选题】Don’t be too ___________! If the manager of the car dealership intended to give you the job, he would have called you by now.
A.
naïve
B.
architects
C.
invests
D.
persists
【多选题】在肿瘤发生过程中,遗传因素可起重要作用的肿瘤有:
A.
肾母细胞瘤
B.
视网膜母细胞瘤
C.
肝细胞癌
D.
纤维瘤病
E.
家族性腺瘤性息肉病
【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】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
【单选题】Mathematica软件中,求解微分方程 , , 的命令为( )。
A.
DSolve[{y''[x]-3y'[x]-4y[x]==0,y==0,y'+5==0},y[x],x]
B.
DSolve[{y''[x]-3y'[x]-4y[x]==0,y[0]==0,y'[0]+5==0},y[x],x]
C.
Dsolve[{y''[x]-3y'[x]-4y[x]==0,y[0]==0,y'[0]+5==0},y[x],x]
D.
Dsolve[{y''[x]-3y'[x]-4y[x]==0,y==0,y'+5==0},y[x],x]
【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.
【多选题】在肿瘤发生过程中,遗传因素可起重要作用的肿瘤包括()。
A.
视网膜母细胞瘤
B.
结肠多发性腺瘤性息肉
C.
神经纤维瘤病
D.
肾母细胞瘤
E.
神经母细胞瘤
【简答题】徐州考古的问题听说前几年在徐州出土过汉代水果,见空气后忽然氧化,求详细资料
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