题目内容
It's appropriate to start a conversation when the meal or beverage is served.
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It goes without saying that ringing the bell for an attendant is common during the travel.
Most passengers will say“thank you" and give a smile in their farewells to the travel.
What you choose to wear should depend on when you travel.
两根不同材料的等截面直杆，承受着相同的拉力，它们的截面面积与长度都相等，问两杆的内力是否相等？
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