信号工进行手指口述操作，可以完全避免事故的发生。
参考答案：错
The first recorded use of natural gas to light street lamps it was in the town of Frederick, New York, in 1825.
A．was
B．is
C．it is
D．were
下列不属于皮肤黏膜出血的是（）
A.瘀点
B.紫癜
C.蜘蛛痣
D.瘀斑
E.血肿
