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【单选题】
凡不是人为故意加入食品中，而是在生产、制造、处理、加工、填充、包装、运输和贮藏等过程中带入食品的任何物质都称为污染物根据上述定义，下列描述不属于食品污染物范畴的是（）。
A.
受培植环境及土壤的影响，鲜银耳容易感染致病菌并产生毒素
B.
病畜的粪便间接通过水体或土壤污染食品
C.
国家明令禁止进口来自日本核污染地区的食品
D.
小作坊违规在腐竹、面粉等食品里添加吊白块
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【单选题】If a diesel engine operates at ahout 700 r/min, then what is it known as?
A.
A slow-spcpd diesel engine
B.
A high-speed diesel engine
C.
A medium-speed diesel engine
D.
None of the above
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【单选题】Compared to a naturally aspirated diesel engine, a supercharged diesel engine has_________.
A.
a cylinder air charge of higher pressure
B.
increased pumping losses
C.
less valve overlap
D.
reduced blow-by
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【判断题】break语句可以用来结束某次循环重新开始下一次循环。
A.
正确
B.
错误
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【单选题】下面代码的输出结果是 weekstr = "星期一星期二星期三星期四星期五星期六星期日" weekid = 3 print(weekstr[weekid*3: weekid*3+3])
A.
星期二
B.
星期三
C.
星期四
D.
星期一
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【单选题】下面代码的输出结果是 weekstr = "星期一星期二星期三星期四星期五星期六星期日" weekid = 3 print(weekstr[weekid*3: weekid*3+3])
A.
星期四
B.
星期二
C.
星期一
D.
星期三
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【单选题】The marine diesel engine is a type of diesel engine used on shipsThe _____ of its operation is not very difficult to understand.
A.
principle
B.
principal
C.
cause
D.
case
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【简答题】机器就功能来说由哪四个部分组成?
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【单选题】下面代码的输出结果是 weekstr = " 星期一星期二星期三星期四星期五星期六星期日 " weekid = 3 print( weekstr[ weekid * 3: weekid * 3+3 ] )
A.
星期一
B.
星期二
C.
星期三
D.
星期四
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【单选题】下面代码的输出结果是 weekstr = "星期一星期二星期三星期四星期五星期六星期日" weekid = 3 print(weekstr[weekid*3: weekid*3+3])
A.
星期五
B.
星期四
C.
星期一
D.
星期三
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【单选题】The diesel engine is also called compression ignition engine because______. A compression stroke is one of the four-strokes of a diesel engine.
B.
the diesel engine is ignited by the heat of compression not by spark .
C.
the diesel engine has a very high compression ratio.
D.
Both A and B
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相关题目：
【单选题】If a diesel engine operates at ahout 700 r/min, then what is it known as?
A.
A slow-spcpd diesel engine
B.
A high-speed diesel engine
C.
A medium-speed diesel engine
D.
None of the above
查看完整题目与答案
【单选题】Compared to a naturally aspirated diesel engine, a supercharged diesel engine has_________.
A.
a cylinder air charge of higher pressure
B.
increased pumping losses
C.
less valve overlap
D.
reduced blow-by
查看完整题目与答案
【判断题】break语句可以用来结束某次循环重新开始下一次循环。
A.
正确
B.
错误
查看完整题目与答案
【单选题】下面代码的输出结果是 weekstr = "星期一星期二星期三星期四星期五星期六星期日" weekid = 3 print(weekstr[weekid*3: weekid*3+3])
A.
星期二
B.
星期三
C.
星期四
D.
星期一
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【单选题】下面代码的输出结果是 weekstr = "星期一星期二星期三星期四星期五星期六星期日" weekid = 3 print(weekstr[weekid*3: weekid*3+3])
A.
星期四
B.
星期二
C.
星期一
D.
星期三
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【单选题】The marine diesel engine is a type of diesel engine used on shipsThe _____ of its operation is not very difficult to understand.
A.
principle
B.
principal
C.
cause
D.
case
查看完整题目与答案
【简答题】机器就功能来说由哪四个部分组成?
查看完整题目与答案
【单选题】下面代码的输出结果是 weekstr = " 星期一星期二星期三星期四星期五星期六星期日 " weekid = 3 print( weekstr[ weekid * 3: weekid * 3+3 ] )
A.
星期一
B.
星期二
C.
星期三
D.
星期四
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【单选题】下面代码的输出结果是 weekstr = "星期一星期二星期三星期四星期五星期六星期日" weekid = 3 print(weekstr[weekid*3: weekid*3+3])
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星期五
B.
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C.
星期一
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星期三
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【单选题】The diesel engine is also called compression ignition engine because______. A compression stroke is one of the four-strokes of a diesel engine.
B.
the diesel engine is ignited by the heat of compression not by spark .
C.
the diesel engine has a very high compression ratio.
D.
Both A and B
查看完整题目与答案