搜题请搜索小程序“爱下问搜题”
问题 单项选择题 A1/A2型题

用不同的管电压摄影时，所选择的毫安值与实际值相差较大时必须调整（）

A.空间电荷抵偿变压器

B.高压接触器

C.高压变压器

D.自耦变压器

E.稳压器

答案

参考答案：A

单项选择题

测定水中可滤残渣时一般选用( )蒸发。

A．(A) 98～100℃

B．(B) 100～102℃

C．(C) 103～105℃

D．(D) 105～107℃
查看答案
单项选择题

待测粉末与氯仿共同振摇，过滤，水浴挥发至几乎干燥。（）

A．Shake the powder being examined with chloroform, filter and reserve the extracted powder.

B．Shake the powder being examined with chloroform, filter and evaporate almost to dryness on a water bath.

C．Heat the powder being examined with a mixture of water and hydrochloric acid in a water bath.

D．Heat the powder being examined to boiling with a mixture of ethanol and water.

E．Shake the powder being examined with sulphuric acid, filter and wash the filter with sulphuric acid.
查看答案