压力表的校验和维护应符合（）规定。
A.劳动部门
B.计量部门
C.企业主管部门
D.公安部门
参考答案：B
影响转炉煤气回收不安全因素是煤气（）和煤气中含氧。
With respect to an option-free bond, when interest-rate changes are large, the duration measure will overestimate the:（）
A. fall in a bond’s price from a given increase in interest rates.
B. increase in a bond’s price from a given increase in interest rates.
C. final bond price from a given increase in interest rates.
