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【单选题】
Which stations may transmit on the frequencies in which distress traffic is taking place?A.
Any station not itself in distress
B.
Any station in distress
C.
All stations which are aware of the distress trafficn
D.
All stations for which silence was imposed by the Rescur Coordination Center or station appointed to coordinate search and rescue activities
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【简答题】简述电子商务的分类
【简答题】阴离子聚合引发剂是_____________给予体,___________试剂,属于碱类。
【单选题】Why do teachers give their students a huge lot of homework and examinations? 查看材料
A.
They have a strong sense of responsibility.
B.
They intend to inspire students' interest in learning.
C.
They are demanded to improve students' scores.
D.
They intend to have students work harder in school.
【简答题】能进行阴离子型聚合的单体在结构上都具有 基团,适合阴离子活性中心与双键进行亲核加成反应。阴离子聚合引发剂是电子 体,亲核试剂,属于碱类。
【单选题】Why do summer schools arrange visits and other activities for the students?
A.
To attract more students.
B.
To make the courses suitable for students of all levels.
C.
To let the students have a good rest.
D.
To help everyone to make new friends, have fun and improve their English.