对于任何管径的钢管都适宜用刀割法进行切断。（）
参考答案：错
--- Got your US visa?
---Not yet. I too busy to apply for an appointment, so I didn’t go to Shanghai last week?
A．was
B．have been
C．had been
D．would be
等位基因有显隐性之分，分别控制不同的性状。[ ]
