喷雾干燥和沸腾干燥是属于（）干燥法。

决策支持系统的英文缩写是DSS。

网上交谈服务可以分为两类（）和多人之间的实时交互式会谈。

Only when _________ the tea-house _______ it was the same place he’d been in last year. [ ]

A. did he reach; he realized      

B. he reached; he realized

C. he reached; did he realize    

D. did he reach; did he realize

散光眼两个主子午向的目标光线不能同时在视网膜清晰结像，故选择性观看最小弥散圆，故（）。

A、视力下降

B、视野缩小

C、视觉疲劳

D、视物变形

向客户出具书面材料的法律意义。