【多选题】Which of the following food is typical on Winter Solstice?
【单选题】向 1 毫升 pH=1.8 的盐酸中加入水()才能使溶液的 PH=2.8。
【多选题】Which of the followings are the traditional activities on Winter Solstice in Southern China?
A.
Making winter solstice rice ball
D.
Making antithetical couplets
【单选题】There is a saying in Shandong province which goes, “eat ______ on Winter Solstice and eat ______ on Summer Solstice.”
【判断题】On Winter Solstice, the sun reaches its southernmost point, the northern hemisphere has the shortest day.
【单选题】向1毫升pH=1.8的盐酸中加入水()才能使溶液的pH=2.8。
【判断题】On Winter Solstice, there is a saying that goes “Eat dumplings on Start of Winter Day, or your ears will be frostbitten”.
【判断题】On Winter Solstice, there is a saying that goes “Eat dumplings on Start of Winter Day, or your ears will be frostbitten”.
【单选题】Eating dumplings on winter solstice is a custom to commemorate________
【简答题】数控程序中圆弧圆心角 ≤180°半径的数值为___,圆弧圆心角>180°半径的数值为___,整圆只能用I、J、K方式。