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【单选题】
马路中间黄色的双实线的化学成分是A.
铬酸钡
B.
铬酸铅
C.
铬酸银
D.
铬酸钙
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举一反三
【简答题】已知X与Y的相关系数Corr(X,Y)=0.25,则Corr(2X+3,4Y+8)=____。
【简答题】在TN接零保护系统中，通过总漏电保护器的工作零线与保护零线之间需要做电气连接吗？
【单选题】在TN接零保护系统中，通过总漏电保护器的工作零线与保护零线之间 ( ) 。
A.
必须再做电气连接
B.
不得再做电气连接
C.
必须再做设备连接
D.
不得再做线路连接
【单选题】A recent spate of launching and operating mishaps with television satellites led to a corresponding surge in claims against companies underwriting satellite insurance. As a result, insurance premiums ...
A.
Since the risk to insurers of satellites is spread over relatively few units, insurance premiums are necessarily very high.
B.
When satellites reach orbit and then fail, the causes of failure are generally impossible to pinpoint with confidence.
C.
The greater the performance demands placed on satellites, the more frequently those satellites break down.
D.
Most satellites are produced in such small numbers that no economies of scale can be realized.
E.
Since many satellites are built by unwieldy international consortia, inefficiencies are inevitable.
【简答题】简述SLS增材制造的成形原理?
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