CREATE TABLE table_18774 ("Serial & Branch" FLOAT, "Seaman" TEXT, "Mechanical" TEXT, "Secretariat" TEXT, "Supply" TEXT, "Electrical" TEXT, "Radio Electrical" TEXT, "Regulating" TEXT, "Medical" TEXT)

What mechanical has lpm regulation?
SELECT "Mechanical" FROM table_18774 WHERE "Regulating" = 'LPM'
SELECT "Mechanical" FROM "table_18774" WHERE "Regulating" = 'LPM'