Marine B(s)/L perform. a number of functions，which of the followings is not correct？ （）
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Logistical operations can be divided into three areas：market distribution，manufacturing support， and（）．
The FPA of marine cargo transportation insurance cover risks of（）．
《国际海运危险货物规则》中的第1大类危险货物是（）。
All the letter of credit are operated by（）．
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