Merchant vessels can operate in three basic ways,but ()is not one of them.
A. liners
B. tramps
C. specialized vessels
D. passenger ships
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杜威认为儿童的兴趣和经验是组织课程的出发点,课程应以儿童的活动为中心,而不是以学科、教材为中心。()
非智力因素在认知活动中具有始动作用、定向作用、维持作用和调节作用。()
When the transmissions of a radio station or a Decca chain,etc.,have broken down,switched
A. Unfunctional
Break down
C. Off power
D. Off air