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【单选题】
在光栅位移传感器中，为了得到两个相位差90°的正弦信号，一般在相距（）莫尔条纹间距的位置上设置两个光电元件。A.
1/4个
B.
1/3个
C.
1/2个
D.
1个
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反馈参考答案：
举一反三
【单选题】Questions 11 to 14 are based on the 4th passage
A.
She might have a hard time finding a job using French
B.
She might have a hard time finding a job using English
C.
She might have a hard time finding a job using Chinese
D.
She might have a hard time finding a job using German
【简答题】设X,Y均为已定义的类名,下列声明X类的对象x1正确的语句是( )。A.static X x1; B.public x x1 = new X(int 123); C.Y x1; D. X x1 = new X( );
【单选题】Questions 11 to 14 are based on the 4th passage
A.
Tourism
B.
Hotel management
C.
Computer science
D.
French
【单选题】设X,Y均为已定义的类名,下列声明类X的对象 x1的语句正确的是( )。
A.
public X x1=new Y() ;
B.
int X x1 ;
C.
X x1=X() ;
D.
X x1=new X() ;
【单选题】设x,y均为已定义的类名,下列声明对象x1的语句正确的是()
A.
public x x1=new y( )
B.
x x1=x ( )
C.
x x1=new x( )
D.
int x x1;
【单选题】Questions 11 to 14 are based on the 4th passage
A.
By working part time in a restaurant
B.
By asking for money from her parents
C.
By getting a scholarship
D.
By opening a shop
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