62×77=4774;
47×34=1598;
18×90=1620;
35×23=805.
I'll be upset ________ someone talks to me ________ I'm reading. [ ]
A. when;while
B. while;when
C. when;when
D. while;while
钢筋混凝土水池结构变形缝施工时,橡胶止水带的现场接头方法是()。
A.热接
B.搭接
C.粘接
D.叠接