与寄主细胞同步复制的噬菌体称为()
A、烈性噬菌体
B、温和噬菌体
C、病毒
D、类病毒
参考答案:B
皮带运输机产生粉尘的地点和原因有几个方面?
The quality of EGC messages is()affected by the position of the ship, the time of reception and climatic conditions.
A.sometimes
B.all times
C.never
D.partly