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【多选题】
39 & 40 Which TWO factors reduce the benefits of shark nets?A.
nets wrongly positioned
B.
strong waves and currents
C.
too many fish
D.
sharks eat holes in nets
E.
moving sands
F.
nets too short
G.
holes in nets scare sharks
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【简答题】The U.S. lies in ______ North America, with Canada to the north, Mexico to the south.
【单选题】作废的操作票应注明“作废”字样，未执行的操作票应注明“未执行”字样，已操作的操作票应注明( )字样。操作票至少应保存1年。
A.
已操作
B.
已执行
C.
合格
D.
已终结
【单选题】The U. S. lies in North America, with Canada to the north, Mexico to the south, the Atlantic to its and the Pacific to its .
A.
northern, east, west
B.
western, east, west
C.
southern, west, east
D.
central, east, west
【判断题】The U.S. lies in the central North America, with Mexico to the north, Canada to the south.
A.
正确
B.
错误
【判断题】同一变电站的操作票应事先连续编号，计算机生成的操作票应在正式出票前连续编号，操作票按编号顺序使用。作废的操作票，应注明“作废”字样，未执行的应注明“未执行”字样，已操作的应注明“已执行”字样。操作票应保存半年。
A.
正确
B.
错误
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