在普通气候环境中进行混凝土施工时,优先选用的水泥是()。
A、硅酸盐水泥B
暂无解析
Thewealthofacountryshouldbemeasured________thehealthandhappinessofitspeopleaswellasthematerialgoodsitcanproduce.
________(catch)intherain,hewaswettotheskin.
已知离散型随机变量X的概率分布为
X10203040
P a
(1)求常数a;(2)求X的数学期望EX.
已知函数11sinxfxxx,记0limxafx,(I)求a的值 (II)若x0时,fxa与kx是同阶无穷小,求常数k的值.
________(fail)severaltimes,theyneedsomeencouragement.