小梳理区
参考答案：
指纤维受到连续梳理的时间较短，即两针面组成的梳理区的工作范围较小
They ______ on the program for almost one week before I joined them, but still no good results _______ so far.
A．had worked ; come out
B．have worked ; came out
C．had been working ; have come out
D．have been working ; have come out
平巷运输信号中电笛或口笛：一长声表示（）。
A.停车
B.向前行
C.向后行
D.向前慢行
