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【单选题】
反映总体分布离中趋势的统计指标是( )。A.
算术平均数
B.
标准差
C.
众数
D.
中位数
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反馈参考答案：
举一反三
【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
【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
【单选题】A diesel engine is similar to a gasoline engine except that the former has no _____.
A.
cross-head
B.
cylinder
C.
connecting rod
D.
spark plug
【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
【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
【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
【简答题】机器就功能来说由哪四个部分组成?
【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
【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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