定向爆破伴有反应:2Al+Fe2O3Al2O3+2Fe,此反应中还原剂是 [ ]
A.Al
B.Fe
C.Fe2O3
D.Al2O3
答案:A
That _______ fun. Let's _______ to see it. [ ]
A. sound; go
B. sounds; go
C. sounds; to go
D. sound; goes
油中溶解气体检测时,变径活塞泵自动全脱气装置,系统真空度残压不高于()。
A.13Pa
B.13.1Pa
C.13.2Pa
D.13.3Pa