测碱度用（）指示剂（）指示剂。_爱下问搜题

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问题填空题

测碱度用（）指示剂（）指示剂。

答案

参考答案：酚酞；甲基橙

问答题简答题

启动汽轮机之前为什么应先启动凝结水泵？

选择题

He is so happy _____ his father has promised to buy him an MP5 player.

A. that
B. while
C. which
D. because