棚内氨气检查方法,当早晨棚膜水滴pH值大于()时,可认为要发生氨气危害,应及时通风。
A.5
B.6
C.6.8
D.8.2
参考答案:D
Bill call play ______ football, but he can't play______drums. [ ]
A. the, the
B. the, /
C. /, the
D. /, /
螺钉调整式喷油器在装配时,若喷油偶件为新件,则应放在()°C左右的柴油中加热清洗,并进行针阀滑动性实验检查,以免产生胶结等故障。
A.50
B.60
C.70
D.80