【单选题】关于功能性抗原决定簇的叙述,下列哪项是正确的
【判断题】“ 三同时 ” 就是安全设施与主体工程的设计、施工和投入运行必须同时。
【单选题】Billy and Tom and Sandy must be ______.
A.
boys who were unknown to Tony' father
B.
boys Tony had run races with before
C.
boys Tony had never raced with before
D.
boys Tony did not expect to race with again
【判断题】“三同时”就是安全设施与主体工程的设计、施工和投入运行必须同时。
【单选题】The two naughty boys were quiet when eating, and they were accustomed to ______ at meals.