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【单选题】
金属处理工艺中，将钢材加热到一定温度，保温适当时间后，在自由流动的空气中均匀冷却，得到珠光体组织的热处理叫（）A.
保温
B.
退火
C.
正火
D.
淬火
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反馈参考答案：
举一反三
【单选题】The professor uses the example of voting for political office in order to
A.
Demonstrate how people make big inferences based on body language even in a short amount of time
B.
Explain that people unconsciously vote for those who are the same gender as the voter
C.
Refute the claim that politicians have bad posture
【简答题】认识有待扩展和有待深化体现了真理的( )。
【单选题】听力原文：M: What's that book you just picked up? W: The sociology text Professor Smith uses in his course. M: You had better read it if you want to pass the course. Smith swears by it. W: But it costs 40 ...
A.
Because it's too expensive to buy it.
B.
Because she doesn't need it.
C.
Because she can't buy it everywhere.
D.
Because she has already got one.
【单选题】听力原文：M: What's that book you just picked up? W: The sociology text professor Smith uses in his course. M: You had better read it if you want to pass the course. W: But it is too expensive. I simply ca...
A.
Because it's too expensive.
B.
Because she doesn't need it.
C.
Because she can't buy it everywhere.
D.
Because she already has got one.
【简答题】设 的联合密度函数为 , 求 与 中至少有一个小于 的概率.
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