世界上最大的群岛国家、被称为“千岛之国”的是[ ]
A.菲律宾
B.印度尼西亚
C.日本
D.马尔代夫
答案:B
25. The watch, which I_________only last week, is out of order again.
A.had repaired
B.had repair
C.had it repaired
D.had it to repair
图示结构A截面的弯矩(以下边受拉为正)MAC为:()
A.-Pl
B.Pl
C.-2Pl
D.2Pl