Let's ________ some fun.[ ]
A. have
B. has
C. had
D. do
答案:A
尿毒症()
A.尿糖(+++)
B.无尿
C.低渗尿
D.等渗尿
E.尿红细胞(+++)
计算题:一蒸馏系统塔顶馏出产品带走热量为50GJ,塔底产品带出热量为40GJ,系统散热损失热量为10GJ,根据热量平衡原理,计算需输入该系统多少GJ的热量?