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【单选题】
车床数控系统中,以下指令正确的是(    )。
A.
G0 S_    
B.
G41 X_
C.
 G40 G0 Z_    
D.
G42 G00 X_  Z_
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【单选题】Which statement is true about the class of an object that can reference the variable base?()
A.
It can be any class.
B.
No class has access to base.
C.
The class must belong to the geometry package.
D.
The class must be a subclass of the class Hypotenuse.
【单选题】Which of the following characteristics is not indicative of an enterprise qualifying as a primary beneficiary with a controlling financial interest in a variable interest entity?
A.
The power to direct the most significant economic performance activities.
B.
The power through voting or similar rights to direct activities, which significantly impact economic performance.
C.
The obligation to absorb potentially significant losses of the entity.
D.
No ability to make decisions about the entity's activities.
E.
The right to receive potentially significant benefits of the entity.
【单选题】The following descriptions about collagen fibers, which one is wrong( )
A.
There are periodic cross striations under electron microscope
B.
appear as wavy structures of variable width
C.
are flexible and have a high tensile strength
D.
are straight and slender, no branches
E.
stain readily with eosin
【多选题】当政府对某种商品实行价格上限管制时,其影响主要包括
A.
产品过剩
B.
产品短缺
C.
消费者按低价买到足够多的商品
D.
产品品质降低
【单选题】在微机的配置中常看到”p4 2.4G”字样,其中数字”2.4G”表示( )
A.
处理器的运算速度是2.4GIPS
B.
处理器的时钟频率是2.4GHZ
C.
处理器与内存间的数据交换速率是2.4GB/S
D.
处理器是pentium4第2.4代
【单选题】When the tilting box of a variable stroke axial-piston pump is perpendicular to the pump shaft, which of the following conditions will exist?
A.
The pistons reciprocate
B.
The ‘B’ end cylinder barrel rotates
C.
There is no fluid flow
D.
Power is transmitted hydraulically
【单选题】钢材的屈强比越小,则其 ( )
A.
塑性越小
B.
抗冲击性越低
C.
屈服强度越高
D.
利用率越低,安全性越高
【多选题】Which statements concerning the value of a member variable are true, when no explicit assignments have been made?()
A.
The value of an int is undetermined.
B.
The value of all numeric types is zero.
C.
The compiler may issue an error if the variable is used before it is initialized.
D.
The value of a String variable is "" (empty string).
E.
The value of all object variables is null.
【多选题】车辆段的主要功能有()
A.
列车的停放、日常检查、清扫;
B.
车辆的修理,包括月修、定修等;
C.
车辆的技术改造;
D.
段内设施设备的维护管理;
E.
乘务员的组织管理;
【单选题】Given: Which statement is true about the class of an object that can reference the variable base? ()
A.
It can be any class.
B.
No class has access to base.
C.
The class must belong to the geometry package.
D.
The class must be a subclass of the class Hypotenuse.
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