盐酸烧伤()
A．创面呈深棕色
B．创面呈黄褐色
C．创面呈黄色
D．创面先为白色后为青铜色
E．创面皂化样变，逐渐加深
参考答案：C
Throughout the world__________advance has been made in science and technology is due to education which brings forth knowledge, creation and inventions.
A．whoever
B．whatever
C．what
D．that
WK-20型挖掘机回转制动器的特点？
