用ν表示电导率,对溶液来说,它是电极面积为lcm2,电极间距为()时溶液的电导,其单位为()。
参考答案:lcm;西(门子)/厘米(S/cm)
25. The student who was caught ______ in the exam has been removed from school.
A.cheat
B.cheated
C.cheating
D.to cheat
固定管板式换热器中温差应力是如何产生的?有哪些补偿温差应力的措施?