提出用钙试剂羧酸钠作指示剂络合滴定法测定降水中钙离子，在自然条件下终点的观察即能顺利进行。

Using the ca reagent carboxylic acid na as the indicator for the determination of calcium ion in the rain was reported. The whole experiment can be carried out under the natural condition.

youdao

我们提供生理和神经探针，特别是钙离子指示剂和膜电位探针。

We also offer physiological and neurological probes, e. g. , calcium indicators and membrane potential probes.

youdao

提供生理和神经探针，特别是钙离子指示剂和膜电位探针。

We also offer physiological and neurological probes, e. g., calcium indicators and membrane potential probes.

youdao