∠α的补角是50度，∠α=______度．
根据定义∠α的补角度数是180°-50°=130°．故答案为130°．
If I remember correctly, you were supposed _____ the keys on your way here. [ ]
A. collecting
B. collect
C. to collect
D. collected
国内某大型钢铁企业需从国外进口铁矿石，考虑到散货船运价上涨的风险，宜选用( )方式安排进口。
A．EXW B．CIF C．FAS D．FOB
