单项选择题
3. 有一台量程为20~100℃的单杠杆气动温度变送器,在测试时得到的数据为P出=0.02MPa时输入才10℃,100℃时P出=0.09MPa应当首先调节( )。
A、A.上移反馈波纹管
B、B.使输入为20℃,并使挡板离开喷嘴
C、C.下移反馈波纹管
D、D.使输入为20℃,并使挡板靠近喷嘴
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