路由设置应有利于减少话务转接的级数,在注意经济合理的同时,应充分考虑网路的(),便于网路管理和维护。
A.安全
B.简单
C.可靠
D.实用
参考答案:A, C
She wants _____ meat. [ ]
A. two kilo of
B. a kilo
C. a kilo of
D. two kilos
Five or more short blasts on a vessel’s whistle indicates that she is().
A.in doubt that another vessel is taking sufficient action to avoid a collision
B.altering course to starboard
C.altering course to port
D.the stand-on vessel and will maintain course and speed