有效性养分 available nutrient

无效养分 non-available nutrient

有效态养分（available nutrient）

最佳的可行方案（Best Available Option）

英译中：Available vehicle capacity

Delay due to port congestion，pilots，tugs not available is a：（）

A:Contingency； B:Emergency； C:A or B； D:not A nor

GROUND POWER AVAILABLE蓝灯亮说明（）

A:外接电源接好且电源正常可用 B:仅外接电源插座接好 C:外接电源接好但电源不可用 D:外接电源没接好但外接电源已可用

One of the main responsibilities of ICMP is to report （1）. Although technology has produced increasingly reliable transmission media, errors still exist and must be handled. IP is an （2）protocol. This means that error checking and error control are not a concem ofIP JCMP wasdesigned, in part, to compensate for this shortcoming. Howerver, ICMP does not （3）errors, itsimply reports them. Error correction is left to the higher-level protocols. Error messages arealways sent to the original（4） because the only information available in the datagram aboutthe route is the source and destination 1P addresses. ICMP uses the source IP address to send theerror massage to the source of the （5）

A:reliable B:unreliable C:available D:Unavailable

________time wil the pilot be available?

A:What B:When C:At what D:At when

Is extra power available________emergency while maneuvering?

A:for B:in C:during D:to