反光膜按其最小逆反射系数值分为（）级，各种标志采用反光膜的级别应符合图纸的规定。
A.二
B.三
C.四
D.五
参考答案：A
Is this the reason _____ in the report for her success in the job ?
A．she explained
B．what she explained
C．how she explained
D．why she explained
仪表气控制范围（）Mpa
A.0.4-0.8
B.0.4-0.6
C.0.4-0.65
D.0.4-0.7
