When you come to Japan, you need to learn some rules for eating. They aren't difficult to learn.

If you eat something with the Japanese, you can hear them say "itadaki-masu". This is to show thanks for the food they eat and to the person who made the food. You can also hear the Japanese say "gochiso-sama" when they finish eating. This is also to show thanks and to say the dishes (菜) are good. They start to eat only when everybody is seated (就座) at the table. They usually have a conversation at meals, but they don't speak while they are eating.

Remember the rules and they can help you. You should also remember that it's good to eat every dish.

根据以上短文内容，判断下列句子正（T）误（F）.

(      ) 1. The Japanese say "itadaki-masu" to show the dishes are delicious.

(      ) 2. The Japanese usually say "gochiso-sama" before the meal.

(      ) 3. The Japanese usually start to eat after everybody sits at the table.

(      ) 4. The Japanese usually don't talk to another person during the meal.

(      ) 5. Eating every dish is bad when you eat in a Japanese home.

按规定方法则得的石料抵抗磨耗作用的能力，其测定方法分别有洛杉矶法、道瑞法、狄法尔法。