排球比赛中，发球队员必须在裁判鸣哨后（）秒钟内将球发出。

羽毛球比赛发球时，要求整个球要低到发球员的（）部位。

羽毛球比赛发球时，要求整个球要低到发球员的胸部部位。

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

有一次，一位女教师上初一女生的排球公开课，教学内容是学习下手发球。教师在进行了下手发球的讲解后，就让学生分两队站在排球场的两个端线上进行发球练习，并在每次发球后都让发球过网的学生举手，但举手的总是寥寥无几。因为初一女生在练习时采用了成人的排球网、正规比赛用的排球，且要在正规的比赛场地上发球过网实在是困难。结果，几次来回后学生的练习热情似乎低落了下来。（1）案例中的教师使用了何种教学方法？教学效果不理想的原因有哪些？（2）试为其指出一种契合要求的教学方法。