目前对朊病毒的复制有两种假说，分别是______________和______________。
参考答案：模板依赖形式；成核-聚合形式
Mr. Duncan raised an unnecessary question __________ he then failed to find an answer.
A．to which
B．for which
C．with which
D．by which
注塑模具模温控制器的温度设定越低越好。
