沉淀反应(precipitation reaction)
参考答案:
可溶性抗原与相应抗体在电解质存在的适当条件下相遇,经过一定时间出现肉眼可见的沉淀现象,称沉淀反应。
Catherine bought a postcard of the place she was visiting, addressed __________ to __________ and then posted it at the nearby post office.
A.it; her
B.it; herself
C.herself; her
D.herself; herself
对于二手个人住房贷款,商业银行最主要的合作单位是()。
A.房地产开发商
B.房地产经纪公司
C.住房资金管理中心
D.担保公司