北京兴业国际贸易公司向韩国五星公司订购一批电子元器件。该批货物于2007年9月15日 (星期六)经海运抵达天津口岸，9月17日(星期一)，兴业公司在天津海关办理了转关手续后经铁路运往北京。9月19日(星期三)货物抵达北京，由于即将迎来国庆节日，且在天津已经办理了海关手续，该公司没有立即在北京海关办理报关手续。国庆节后，该公司于10月12日(星期五)委托某报关行向北京海关申报货物。该批货物经海关审定完税价格为100万元人民币。
根据上述情况，回答以下问题：

题中所叙述的这种转关方式应该属于( )。

A．提前报关方式

B．直转报关方式

C．中转报关方式

D．境外转关运输

Most computer systems are (16) to two different groups of attacks: Insider attacks and outsider attacks. A system that is known to be (17) to an outsider attack by preventing.
(18) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (19) users. Detecting such abusive usage as well as attacks by outsides not only provides information on damage assessment, but also helps to prevent future attacks. These attacks are usually (20) by tools referred to as Intrusion Detection Systems.

A．reliable

B．secure

C．indestructible

D．steady