有四枚电阻应变计 R 1 、 R 2 、 R 3 、 R 4 贴在构件的四个测点,用单点加温度补偿法逐点测得四个点的应变分别为 ε 1 =300 με , ε 2 =-300 με , ε 3 =400 με , ε 4 =-400 με 。若将这四枚应变计接成图示的形式,应变仪的读数是( A)
A.
ε r =1400 με
B.
ε r =600 με
C.
ε r =800 με
D.
0
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举一反三
【单选题】“All business executives have accounting experience, and some business executives are not economists.” Which of the following statements follows validly from these premises?
A.
Some economists do not have accounting experience.
B.
Some people with accounting experience are not economists.
C.
All people with accounting experience are business executives.