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。