It is another kind of security. K: Yes.
学：那是另一种安全。克：是的。
The present invention relates to lead-less piezoelectric ceramic composition and is especially one kind of lead-less Li-Na-K niobate piezoelectric ceramic and its preparation process.
一种高居里点铌酸钾钠锂系无铅压电陶瓷及其制备工艺，涉及一种性能优良的无铅压 电陶瓷组合物的配方及制备工艺。
A kind of K drought index and its criterion are made by using spring precipitation and evaporation data of 140 stations in Northwest China from 1971-2000.
用西北地区140个气象站1971～2000年的春季降水、蒸发资料，计算了一种K干旱指数，并制定了干旱标准，分析了西北春季干旱的气候特征。
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