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【单选题】
超导磁的能量密度很高,约()J/m3,可建成大容量系统。
A.
10^6
B.
10^7
C.
10^8
D.
10^9
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【单选题】Copper alloys are generally used for their
A.
Low thermal conductivity
B.
High electrical conductivity
C.
Low electrical conductivity
D.
Low mass density
【单选题】对于下列MATLAB程序的运行结果,正确的是() A=[1,2,3;4,5,6;7,8,9]; B=A(:,end:-1:1)
A.
B= 1    2    3 4    5    6 7    8    9
B.
B= 7    8    9 4    5    6 1    2    3
C.
B= 3    2    1 6    5    4 9    8    7
D.
B= 9    8    7 6    5    4 3    2    1
【简答题】Thermoplastic plastics are generally best for which of the following type of service conditions? A) impact B) creep resistance C) chemical exposure D) flammability
【单选题】Aluminium alloys are generally used for their
A.
Low thermal conductivity
B.
Low electrical conductivity
C.
Excellent corrosion resistance
D.
High mass density
【单选题】建设部《建筑业企业职工安全培训教育暂行规定》(建教[1997]83号)及《建筑施工安全检查标准》(JGJ59-99)规定了企业职工安全培训教育的具体要求。企业法人代表,项目经理每年参培不少于()学时。
A.
20
B.
30
C.
40
D.
50
【单选题】Costs of ground handling on a per kg basis are generally lower for small consignments. ( )
A.
正确
B.
错误
【判断题】Comparators are generally used for quick checking of the linear dimensions.
A.
正确
B.
错误
【判断题】pneumatic drive system are generally used for smaller robots.
A.
正确
B.
错误
【单选题】下列程序运行结果正确的是: a=7; b=a- -;
A.
b=6,a=5
B.
b=7,a=5
C.
b=6,a=6
D.
b=5,a=5
【单选题】下列程序的运行结果是( )。 #include void main {int s=0,k; for(k=7;k>1;k--) {switch(k) {case 1: case 4: case 7: s++: break; case 2: case 3: case 6:break; case 0: case 5: s+=2: break; }} printf('s=%d',s); }
A.
s=3
B.
s=4
C.
s=5
D.
无输出结果
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