President Biden will unveil an infrastructure plan on Wednesday whose $2 trillion price tag would translate into 20,000 miles of rebuilt roads, repairs to the 10 most economically important bridges in the country, the elimination of lead pipes and service lines from the nation’s water supplies and a long list of other projects intended to create millions of jobs in the short run and strengthen American competitiveness in the long run. Mr. Biden’s administration has named it the “American Jobs Plan,” echoing the $1.9 trillion pandemic relief bill that Mr. Biden signed into law this month, the “American Rescue Plan.” The spending in the plan covers a wide range of physical infrastructure projects, including transportation, broadband, the electric grid and housing; efforts to jump-start advanced manufacturing; and other industries officials see as key to the United States’ growing economic competition with China. It proposes the creation of a “Clean Electricity Standard” — essentially, a federal mandate requiring that a certain percentage of electricity in the United States be generated by zero-carbon energy sources like wind, solar and possibly nuclear power.