灭火器上压力表零位误差不大于灭火器20℃时工作压力值的（）%。
A、±2
B、±4
C、±6
D、±8
参考答案：C
An amount of money by his father.[ ]
A. left
B. were left
C. was left
D. leaves
Ⅲ度烧伤后2～3周，焦痂自溶阶段，最好采用（）
A.扩创手术
B.包扎手术
C.削痂
D.涂磺胺嘧啶银
E.大剂量抗生素
