核医学治疗中所常用的放射性药物，主要利用其放出射线()
A．α线
B．β+线
C．β-线
D．γ线
E．康普顿电子射线
参考答案：C
Making mistakes is a part of learning. By pointing out your errors and _____ you correct them, a teacher is
teaching you. [ ]
A. help
B. helps
C. helping
D. to help
焦炉煤气在标准状况下的着火温度国（）。
