按熔渣的酸碱度，焊条通常可分为几类？
参考答案：
按熔渣的酸碱度，焊条通常可分为酸性焊条和碱性焊条（又称低氢性焊条）两类。
从II栏中选出I栏中各句的正确答语,有两个多余选项。
I
小题1: Is this a pen?
小题2:Where are your brothers?
小题3:What color is your pen?
小题4:Do you like vegetables for lunch？
小题5:.How are your family?
II
A．It’s black.
B．We are fine,thanks.
C．No,it isn’t.My pen is red.
D．Yes,they are healthy.E. They are in Beijing.
F.That sounds relaxing.
G..No,it’s a pencil.
小题6:Is this a pen?
小题7:Where are your brothers?
小题8:What color is your pen?
小题9:Do you like vegetables for lunch?
小题10:How are your family?
民法规定诉讼时效一律为两年，从被侵害之日起计算。 ( )
