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【简答题】
金属材料的性能包含 和 两方面。 2、 材料在外力的作用下将发生形状和尺寸变化,称为 。 3、 随着外力被撤销后而完全消失的变形,属于 。 4、 外力被撤销后不能消失二残留下来的变形,是 。 5、 强度时指金属材料抵抗 和 的能力。 6、 金属在外力 时,试样的变形仍在继续,这种现象被称为屈服。 7、 应力σ是 的内力。 8、 内力是指材料受到 作用后,其 产生的相互作用力。 9、 是指金属材料产生永久变形的能力,用 和 评价塑性好坏。
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【简答题】A．Because he could stay with his relatives. B．Because a trip to that place is within his budget. C．Because the man wants to improve his English. D．Because the man Wants to make some new friends.
【单选题】下列有关精子的结构哪项是错误的？
A.
细胞核浓缩构成头部
B.
核的前2/3覆盖有顶体
C.
尾部分为颈段、中段、主段和末段
D.
精子尾部的中轴是由微管组成的轴丝
E.
尾部的颈段线粒体呈螺旋状排列
【单选题】He took off his expensive watch _________ the fact that he was rich. A. to hide B. hid C. hide D. hidden
A.
to hide
B.
hid
C.
hide
D.
hidden
【简答题】篇章结构。 __ 1 __ He had more money than he could ever spend,and he was admired and looked up to by his community.__ 2 __ He wasn't happy.All his life he had been pursuing happiness and striving(奋斗)for ha...
【简答题】翻译:你觉得我们的新年晚会怎么样?
【简答题】您喜欢吃糖醋鱼吗?
【简答题】He could not hide his (irritate) ________ when his daughter contradicted what he said.
【单选题】The author could not find a palce to hide, so he had a minor head injuries.
A.
T
B.
F
C.
NG
D.
None
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