Candidates who pass the examination and pass the physical examination will be admitted. Therefore, if Li Ming passes the exam but is not admitted, he must fail the physical examination.
The argument that if the employees of Unit A go to Guangzhou on business and go alone, they will all take the high-speed rail. Therefore, if Xiao Wu of Unit A goes to Guangzhou on business, but does not take the high-speed rail, then he must not go alone is similar to the above argument.