语文课外作业的类型（） ["练习型课外作业","准备型的课外作业","扩展型的课外作业","创造型的课外作业"]
A snag or other underwater obstruction may form a（）. ["V-shaped ripple with the point of the V pointing upstream","V-shaped ripple with the point of the V pointing downstream","small patch of smooth water on a windy day","smoothing out of the vessel's wake"]
擅自使用与所有人的特殊标志相同或者近似的文字、图形或者其组合的，工商行政管理部门立即停止其侵权行为，没收侵权商品，没收违法所得，并处违法所得（）以下的罚款，没有违法所得的，处（）以下的罚款。 ["5倍；1万元","3倍；1万元","5倍；3万元","3倍；3万元"]
（）, where minor repairs are carried out with a ship service, often during a stay in portThis may be remote from a ship repair site. ["voyage repairs","routine docking","damage repairs","conversio"]
A section of the river that is narrower than usual and is often navigable from bank to bank is a（）. ["chute","stabilized channel","slough","navigable pa"]
断路器中为什么要设置灭弧室？
