CREATE TABLE table_30317 ("Year Location" CLOB, "Mens Singles" CLOB, "Womens Singles" CLOB, "Mens Doubles" CLOB, "Womens Doubles" CLOB)

In what year and location did Liu Guozheng win the Mens Singles?
SELECT "Year Location" FROM table_30317 WHERE "Mens Singles" = 'Liu Guozheng'
SELECT "Year Location" FROM "table_30317" WHERE "Mens Singles" = 'Liu Guozheng'