模型试验对材料有一定要求,通常不一定可以做到的是()。
A.保证相似要求与量测要求
B.材料要求性能稳定、徐变小
C.保证模型材料与原形材料一致
D.加工制作方便
参考答案:C
小题1:Peter was running so fast that he couldn’t stop _____. (he)
小题2:My American friend is learning to eat with ______. (chopstick)
小题3:At present, Billy is fourteen years old and in the ______ grade. (nine)
小题4:When the thief saw the policeman, he ran away as ______ as he could. (quick)
小题5:“You ought to ______ more to improve your English, boys and girls.” said Mr. Brown (read)
遗传性共济失调的病理改变的特征()
A.共济失调表现
B.小脑损害
C.世代相传的遗传背景
D.脑干损害
E.大脑损害