对微机工作影响最小的因素是 ( )
A．湿度
B．噪声
C．磁场
D．温度
参考答案：B
JTl型通用式机车信号带电源接线盒电路由哪几部分组成？
My cousin has been learning English _____she was six years old.
A．when
B．since
C．until
D．because
