窗帘盒安装两端距窗洞长度差为( )mm。
A．1
B．2
C．3
D．4
参考答案：C
In relation to employment law:
(b) State how the courts decide whether someone is an employee or is self-employed. (6 marks)
尖轨根部接头轨面或内侧错牙不超过（）
A.1mm
B.2mm
C.3mm
