用卷扬机牵引起吊安装物件,在起吊重物匀速运行时,起吊重物突然碰撞在建筑物体上,这时钢绳受到的载荷是()。
A、静载荷
B、动载荷
C、冲击载荷
D、循环载荷
参考答案:C
Grandma is ill. Please take her to the ______ at once. [ ]
A. station
B. hospital
C. shop
D. house
给定序列{3,5,7,9,11,13,15,17},