A cow can milk 9 kilograms a day. According to this calculation, how many kilograms can this cow be milked in February this year?
一头奶牛一天可挤奶9千克，照这样计算，这头奶牛今年二月份可以挤奶多少千克？
<gadget id="calculator">9 * 28</gadget>
<output>252</output>

<result>252</result>