By regulation，cargo tank atmosphere must be inert before and during which operation?（）

By regulation，cargo tanks must be inert before and during what operation?（）.

The necessity of the segregation of cargoes is determined by（）.

It must never be forgotten（）the master has no authority to take extraordinary measures for the cargo owner if the latter or his representative can be communicated with.

根据IMDG规则的规定，危险货物分为（）大类，共（）类别。

物流包装按（）的不同分为食品包装、药品包装、机电产品包装和危险品包装。

Dunnage may be used to protect a cargo from loss or damage by（）.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

Sometimes the contract（）that the lump sum freight must be paid in advance and will not be returnable even if the vessel and／or her cargo are lost.

Hatch No.1 must be cleaned up to meet the（）of the cargo surveyors．

《BC规则》中（）可以在《IMDG规则》查到。

简述《国际海运危险货物规则》中对于危险货物包装的基本要求。