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【单选题】
自然铜的主要成分是A.
FeS2
B.
CuS
C.
CuO
D.
FeO2
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】He is awful. I'd never seen a ______, less coordinated boxer.
A.
clumsier
B.
smarter
C.
efficient
D.
beloved
【单选题】TSP 算法流程图如下图 I. 示意,回答问题:外层循环 (I 变量控制的循环 ) 的作用是 _________ 。
A.
其它三个选项都不是
B.
用于完整地产生一个路径
C.
用于寻找距当前城市距离最近的城市
D.
用于判断某个城市是否是已访问过的城市
【单选题】—I'm sorry to hear that Bill failed the exam again. —Don't worry about him. I'm sure that he will never give up until he ________. [ ]
A.
succeed
B.
succeeds
C.
succeeded
D.
succeeding
【单选题】听力原文：M: Sam's voice sounds awful. I could barely hear him. I think he needs to take a few days off. W: Yes, he' s got a terrible sore throat. The doctor said he shouldn't even attempt to whisper. Q: W...
A.
It's harmful for him to use his voice.
B.
He needs to see a doctor.
C.
He hasn't been taking his medicine.
D.
It's difficult to understand him when he whispers.
【单选题】TSP算法流程图如下图I.示意,回答问题:中层循环(K变量控制的循环)的作用是_________。
A.
用于判断某个城市是否是已访问过的城市
B.
用于寻找距当前城市距离最近的城市
C.
用于完整地产生一个路径
D.
上述都不是
【单选题】TSP算法流程图如下图I.示意，回答问题：外层循环(I变量控制的循环)的作用是_________。 【图片】
A.
用于完整地产生一个路径
B.
用于判断某个城市是否是已访问过的城市
C.
用于寻找距当前城市距离最近的城市
D.
其它三个选项都不是
【单选题】TSP算法流程图如下图I.示意，回答问题：外层循环(I变量控制的循环)的作用是_________。 【图片】
A.
用于判断某个城市是否是已访问过的城市
B.
用于寻找距当前城市距离最近的城市
C.
用于完整地产生一个路径
D.
上述都不是
【简答题】A．He seldom goes there. B．He used to go there frequently. C．He often goes there. D．He never goes there.
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