供水战斗车接出两支水带干线,直接向水枪供水灭火的是()。
A、单干线直接供水
B、双干线直接供水
C、双干线并联供水
D、消防车并联供水
参考答案:B
—What do you think of memory?
—When _____ happens, our memory usually works well. [ ]
A. dramatic something
B. dramatic anything
C. something dramatic
D. anything dramatic
怎么样根据聚合物粘度的温敏特性以及切敏特性选择加工条件?(仅供参考)