在测定时发现结果均偏高,这种误差最大可能是由于()
A.仪器灵敏度减低
B.标准液被稀释
C.方法选择错误
D.比色杯本底增高
E.操作人员对过程不熟
参考答案:B
In order to correctly open a new coil of manila line,you should().
A.pull the tagged end from the top of the coil
B.pull the tagged end through the eye of the coil
C.secure the outside end unroll the coil
D.unreel the coil from a spool
含一氧化碳最高的煤气是()。
A、焦炉煤气
B、转炉煤气
C、高炉煤气