When you doubt the existence of risk of collision,().
A. such risk shall be deemed to exist
B. such risk shall not be deemed to exist
C. you needn't take any action to avoid collision with any vessel
D. you should accelerate your speed ahead
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轧钢皮的主要成分是FeO,在烧结料中添加轧钢皮,可以有效地()固体燃料的消耗量。
理性预期就是运用某经济变量的过去记录去预测未来,反复检验和修订,采取错了再试的方式,使预期逐渐符合客观的过程。
A. 正确
B. 错误