I guess Mary's father____(重)about 150 pounds.
-- Does this plant have big leaves? -
读图,回答下列问题。
4494÷42=( )
光具有波粒二象性,个别光子往往表现出____性,大量光子表现出____,高频光子表现出____,低频光子易表现出____,光在传播过程中显示____,光与物质发生作用时____.