The visa and immigration IELTS exam is about to start registration and testing. This is a new test reform measure. The first test will be held later this month, with a fee of 2000 yuan. Candidates need to register at the designated test center and ...
electrons of a metal are pairing to form quasi-particles, named as Cooper's pairs. The supperconducting state is the condensate of macroscopic number of Cooper's pairs in a...
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