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【单选题】
下列不符合动火分析规定的是( )。A.
取样要有代表性，特殊动火的分析样品要保留到动火作业结束
B.
取样时间与动火作业的不得超过60min，如超过此间隔时间或动火停歇时间为60min以上，必须重新取样分析一
C.
若有两种以上的混合可燃气体，爆炸下限低者为准
D.
进入设备内动火，同时还需分析测定空气中有毒有害气体和氧含量，有毒有害气体含量不得超过《工业企业设计卫生标准》(GBZ 1-2010)规定的最高容许浓度，氧含量应为18％～22％
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【单选题】根据现行的国家标准，下列哪一项指标不属于电能质量指标？（）
A.
电压偏差和三相电压不平衡度限值
B.
电压波动和闪变限值
C.
谐波电压和谐波电流限值
D.
系统短路容量限值
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【单选题】—Need I accomplish all we have set out to do? —Yes, you ____; otherwise you ____fired.
A.
need; would have been
B.
may; need have been
C.
can; mustn't have been
D.
must; would be
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