PET显像探测的射线是()
A.β-射线
B.β+射线
C.γ射线
D.α射线
E.X射线
参考答案:C
The general ordered that the thief____.
A.be punished
B.would punish
C.would be punished
D.should punish
混凝土从装料到入仓卸料整个过程不宜超过()。
A.15~20min
B.20~30min
C.30~60min