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【单选题】
在车床两顶尖上装夹车削光轴，加工后检验发现中间直径偏小，两端直径偏大，其最可能的原因是( )。A.
两顶尖处刚度不足
B.
刀具刚度不足
C.
工件刚度不足
D.
刀尖高度位置不准确
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反馈参考答案：
举一反三
【单选题】这次事故给了他一个教训,从那以后他再也没有酒后开过车。
A.
The accident taught him a lesson, and from then on, he has never driven a car after drinking.
B.
The accident taught him a lesson, and from now on, he has never driven a car after drinking.
C.
The accident taught him a class, and from then on, he has never driven a car after drinking.
D.
The accident gave him a lesson, and from now on, he has never driven a car after drinking.
【单选题】He has never driven his own car to work. B) He moved to Washington, D.C. 6 years ago. C) He was hit by a car twice in Portland. D) He now lived in Washington, D.C.
A.
He has never driven his own car to work.
B.
He moved to Washington, D.
【单选题】这次事故给了他一个教训,从那以后他再也没有酒后开过车。
A.
The accident taught him a lesson, and he has never driven a car.
B.
It taught him a lesson, and from then on, he has never driven a car after drinking.
C.
The accident taught him a lesson, and from now on, he has never driven a car.
D.
The accident taught him a lesson, and from then on, he has never driven a car after drinking.
【单选题】Once one was dependent on a kind of substance, he/she______.
A.
would require more and more of the substance
B.
could recover and never need the substance again
C.
would feel unpleasant with more of the substance
D.
must have the substance everyday
【简答题】请问require和require_once的区别是什么？
【多选题】下列关于基尔霍夫定律说法对的是
A.
基尔霍夫定律具有普遍性，不仅适用于直流电路，也适用于交流电路
B.
基尔霍夫节点电流定律仅适用于电路中的节点
C.
基尔霍夫定律不仅适用于线性电路，而且对非线性电路也适用
D.
基尔霍夫电压定律不仅与元件的相互连接方式有关，还与元件的性质有关
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