目前船体构件边缘加工的主要工艺方法是（）。
A、机械剪切
B、气割
C、刨边
D、铣边
参考答案：A, B, C, D
Babu Dhaliwal, CFA, does research about foreign exchange market. The euro per Argentine peso (EUR/ARS) spot rate is 0.1789 and the forward rate is at a discount of 0.27%. The forward rate is closest to:（）
A. 0.1741
B. 0.1784
C. 0.1794
矿井必须作好水害分析预报，坚持有疑必探，先掘后探的探放水原则。
