题目

中国载人航天已经处于世界领先水平．航天器部分采用钛合金器件有强度高而密度，机械性能好，韧性和抗蚀性能很好等性能优良特点．由于太空中有阳光照射时温度很高，无阳光时温度很低，所以在选材料时还应该考虑选用热胀冷缩（填“显著”或者“不显著”）的材料． 答案：【1】小【2】不显著将短文中划线部分的句子译成中文（共4分，每小题2分）小题1:Friendship is one of the greatest pleasures that people can enjoy .A true friend does indeed find pleasure in our joy and share pity in our sadness . He or she is always at our side to give us his or her help .Knowing how important friendship is ,小题2:we should be very careful in our choosing of a friend . We must choose someone who has a good character , who does everything good and who shows kindness of heart . We should avoid (避免) those people who are easily changed .