【单选题】The word 'that' in 'That is economic foolishness' in the fourth paragraph refers to ______.
B.
the exploitation of the seabeds
【多选题】在跨境贸易货款支付中货币较少使用,主要采用票据。票据是各国通行的结算工具和信用工具,主要包括( )。
【简答题】According to the fourth paragraph, which of the following is NOT true?
【判断题】在感性负载两端并联电容器,电路的功率因素一定会提高。