船舶在入海河口航行,要做到充分利用潮汐提高航速,必须注意().
A、合理掌握开航时间
B、合理掌握航速
C、合理掌握转流时刻的流速分布规律
D、ABC都对
参考答案:D
简述培训效果跟踪与监控的程序和方法。
. ______ the question made her teacher angry and upset.
A.Jenny refuses to answer
B.Jenny refusing to answer
C.Jenny’s refusing to answer
D.Jenny’s refusing answering