在计算加权综合指数时，指数中分子和分母的权数必须是（）。 不同时期的。 同一时期的。 基期的。 报告期的。
The officer in charge of the engineering watch shall ensure that at all times bridge orders relating to changes in （） of operation are immediately implemented. ahead or astern。 fore or aft。 up or down。 speed or directio。
沈思CEO是如何摆脱低迷状态的？（） 唱歌释放压力。 信仰教会。 与失败过的成功人士进行交流。 保持良好的睡眠。
A permanent chain chasing system is used to（）. clean anchor chain as it's hauled in。 recover anchors which have lost their buoys。 run and retrieve anchors。 prepare anchor chain for inspectio。
The officer in charge of the engineering watch shall ensure that all machinery involved with the maneuvering of the ship can immediately be placed in the （） of operation when notified that the ship is in congested waters. manual mode。 automatic mode。 remote mode。 follow-up mode。
与非冬眠时相比，动物在冬眠时：（）
