钢管的连接方法有( )。
A．焊接
B．法兰盘连接
C．螺纹连接
D．丝扣连接
参考答案：A,B,D
After the new technique was introduced, the factory produced _____ cars in 2010 as the year before.
A．as twice many
B．as many twice
C．twice as many
D．twice many as
胸痹心痛的病位在
A．肾
B．肝
C．脾
D．心
