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【单选题】
检查电气线路或电动机的绝缘电阻的的仪器有（）.A.
钳表
B.
C.
接地电阻仪
D.
电压表
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举一反三
【单选题】The situation in the Middle East is so ______ that we have to be ______ when dealing with the hostage issue. [ ]
A.
complex; cautious
B.
difficult; anxious
C.
mixed; careful
D.
mild; eager
【简答题】When I caught him ________ I stopped buying things there and started dealing with another shop. A) cheating B) cheat C) to cheat D) to be cheating
【单选题】The most important thing to keep in ________ mind when dealing with________ emergency is to stay calm.
A.
/; the
B.
the; an
C.
the; the
D.
/; an
【简答题】已知两平行平面2x+y-2z-3=0和2x+y-2z+15=0, (1) 求平行平面的距离; (2)若球面S与两平面都相切,且该球面过点A(1,1,0)、B(-1,0,-1)、C(0,2,0),求该球面方程。
【单选题】已知 ABC的顶点为A(2,1,5),B(0,4,-1)和C(3,4,-7),则过点M(2,-6,3)且与 ABC所在平面平行的平面方程为( )
A.
6x+10y+3z+39=0
B.
2x+3y+4z-7=0
C.
3x+2y-z+18=0
D.
4x-y+z-10=0
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