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【单选题】
关于提高分析结果准确度的方法,下列表述中正确的是:A.
)选择灵敏度高的仪器分析方法;(2)增加平行测定次数减小随机误差;
B.
)称样量越小越好;(4)做对照试验消除系统误差
C.
2,3
D.
2,4
E.
1,2
F.
1,3
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【单选题】利用 QFC-5 微电脑发动机综合检测仪检测点火高压时,由于该机不一定反映实际高压值的变化,故应配合( )来判断点火情况。
A.
点火提前角
B.
断电器触点闭合角
C.
点火波形
D.
点火高压
【单选题】A month ago I wrote to the store complaining about its had service, but I haven’t gotten a(n) ____yet.
A.
resource
B.
triumph
C.
response
D.
inherit
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【单选题】利用QFC-5微电脑发动机综合检测仪检测点火提前角,应分别测600r/min、1’200r/min和( )r/min三种转速下的点火提前角。
A.
1’800
B.
2’500
C.
2’000
D.
2’500
【单选题】利用QFC—5微电脑发动机综合检测仪检测点火高压(kV),测量中如出现转速不稳或转速偏差太大时,应更换()缸的位置,进行第二次测量。
A.
标准
B.
第一
C.
第六
D.
第四
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