东汉时期发明的、为了节约人力、提高冶炼质量,在冶净铁方面的重大发明是[ ]
A.水排
B.提花机
C.印刷术
D.翻车
答案:A
下列命题的逆命题正确的是( )
A.全等三角形的面积相等
B.全等三角形的对应角相等
C.直角三角形
D.等边三角形的三个角都等于60°
____ fired,your health care and other benefits will not be immediately cut off. [ ]
A. Would you be
B. Should you be
C. Could you be
D. Might you be