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【单选题】
抽样误差是由于( )引起的。A.
破坏了随机原则
B.
样本容量过小
C.
抽样过程中的偶然因素
D.
观察、测量、计算失误
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反馈参考答案：
举一反三
【单选题】脉冲当量是指( )
A.
每发一个脉冲信号,相应丝杠产生转角大小
B.
每发一个脉冲信号,伺服电机转过的角度
C.
进给速度大小
D.
每发一个脉冲信号,机床移动部件的位移量
【单选题】— Is Mr. Green at home? — No, he ______ Shanghai. [ ]
A.
has been to
B.
has gone to
C.
is going to
【单选题】Mr. Green has recently been ______ of the company.
A.
appointed to president
B.
appointed president
C.
appointed a president
D.
appointed the president
【单选题】—Mr. Brown is a hardworking man and he has achieved great success. —_________ [ ]
A.
So is Mr. Green.
B.
So has Mr. Green.
C.
It's the same with Mr. Green.
【单选题】Green tea has in recent years attracted much attention in the West for a wide range of possible ______ effects.
A.
advantageous
B.
beneficial
C.
favorable
D.
preferable
【单选题】—Look! Is that Mr. Green? —It be Mr. Green. He has gone to Shanghai.
A.
must
B.
can
C.
mustn’t
D.
can’t
【单选题】脉冲当量是指()
A.
每发一个脉冲信号，机床移动部件的位移量
B.
每发一个脉冲信号，伺服电机转过的角度
C.
进给速度大小
D.
每发一个脉冲信号，相应丝杠产生转角大小
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