This a pair of socks [ ]
A. is
B. are
C. am
答案:A
“塔吊”是建筑工地上普遍使用的一种起重设备,如图所示是“塔吊”的简化图。OB是竖直支架,ED是水平臂,OE段叫平衡臂,E端装有配重体,OD段叫吊臂,C处装有滑轮,可以在O、D之间移动。已知OE=10m,OC=15m,CD=10m,若在C点用此塔吊能起吊重物的最大质量是1.5×103Kg,则(1)配重体的质量应为多少Kg?(2)当滑轮移到D点时能够安全起吊重物的最大质量是多少Kg?(不计“水平臂”和滑轮重力)(8分)
When the seller pays for the goods to be loaded on board the container ship, but does not pay freight or insurance, what is most appropriate term ()
A.DDU
B.CFR
C.FCA
D.CIF