【简答题】根据短文意思回答问题。 Sam: What's this? It's an American eraser. It is made in our hometown. But it isn't mine. Hi ! Jim, is this your eraser? Jim: No, it isn't. Maybe it's Ann's, I think. Sam: Excuse me, Ann...
【单选题】硅酸盐水泥养护时浇水天数不得少于( )。
【多选题】关于混凝土养护措施,应符合下列哪些规定?()
A.
应在浇注完毕的24小时内加以覆盖并保湿养护;
B.
对采用硅酸盐水泥拌制的混凝土,不得少于7天;
C.
浇水次数应能保持混凝土处于湿润状态,混凝土养护用水与拌制用水相同;
D.
混凝土强度达到1.2N/mm2前,不得在其上踩踏。
【多选题】下列关于混凝土养护表述正确的是( )
A.
应在浇筑完毕后的12h同对混凝土加以覆盖并洒水养护
B.
混凝土浇水养护的时间,普通硅酸盐水泥拌制的不得少于7天
【简答题】Why does Watson want readers to read Shi Ji , Han Shu and Zuo Zhuan the way they read the works of Herodotus, Thucydides, Polybius, or Livy? What do you think of Watson’s understanding of Shi Ji?