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【单选题】
二次电子像衬度最亮的区域是A.
和电子束垂直的表面
B.
法线 和电子束成30º的表面
C.
法线 和电子束成45º的表面
D.
法线 和电子束成60º的表面
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】下列有关糖蛋白和蛋白聚糖的叙述,错误的是
A.
糖蛋白中糖所占的比例较蛋白质少
B.
蛋白聚糖中蛋白质所占的比例小于聚糖
C.
糖蛋白和蛋白聚糖中糖的结构和性质不同
D.
糖蛋白和蛋白聚糖在体内的分布不同
E.
糖蛋白中是长的多糖链，而蛋白聚糖中是短的寡糖链
【单选题】Hello, I’m Frank. I’m twenty⁃four years old. I live in Beijing now. There are many tall buildings, big buses and busy streets in this city. My flat (公寓) is on the eighth floor of a ten⁃floor building....
A.
It’s small and dirty.
B.
It’s big and tidy.
C.
It’s small but tidy.
D.
It’s big but dirty.
【单选题】塑料可分为通用塑料、工程塑料和特种塑料。工程塑料比通用塑料具有以下（）等优良的特性。
A.
强度好、刚度高
B.
耐磨性高、耐热性好、耐腐蚀性能好
C.
抗蠕变、尺寸稳定性好
D.
前面三个答案全对
【单选题】Hello, I’m Frank. I’m twenty⁃four years old. I live in Beijing now. There are many tall buildings, big buses and busy streets in this city. My flat (公寓) is on the eighth floor of a ten⁃floor building....
A.
Frank works on a busy street.
B.
Frank is twenty⁃four years old.
C.
There is a park in front of Frank’s flat.
D.
Frank doesn’t like his job because it makes him tired.
【单选题】Death of a Salesman was written by
A.
Arthur Miller
B.
Ernest Hemingway
C.
Ralph Ellison
D.
James Baldwin
【简答题】yze the character of Willy Loman in Death of a Salesman by Arthur Miller.
【简答题】Willy, the character in Death of a Salesman, was diagnosed by two psychiatrists to get suffering from______.
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