题目内容

After dinner, the four key negotiators resumed their talks, which continued well into the night.

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Fortunately, there have always been a few dedicated attorneys(律师) who resisr the power traps and who have worked for a progressive society. Today, in San Francisco Bay Area and elsewhere, you can find ads for "New Age Attorneys" dedicated to resolving conflicts rather than promoting them. There is even a new law school in San Francisco designed to produced a new breed of public service attorneys.

多晶体与单晶体在性能上的主要区别是

A. 多晶体有晶界
B. 多晶体中相邻晶粒的晶体位向不同
C. 多晶体无各向异性
D. 多晶体的性能具有方向性

金属材料、陶瓷材料和高分子材料的本质区别在于它们的

A. 性能
B. 结构
C. 结合键
D. 熔点

每个体心立方晶胞中实际包含个原子

A. 2
B. 4
C. 6
D. 8