现要安装“220V 25W”灯泡25只，应选择的保险丝规格是_刷题宝

题干

现要安装“220V 25W”灯泡25只，应选择的保险丝规格是（）

A：熔断电流为3A的保险丝

B：额定电流为3A的保险丝

C：熔断电流为5A的保险丝

D：额定电流为5A的保险丝

上一题下一题 0.0难度选择题更新时间:2019-02-28 10:11:32

答案(点此获取答案解析）

B

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除去下列物质中少量杂质所加入试剂合理的是(　　)

选项	物质	所含杂质	除去杂质所加试剂
A	Ca(OH)₂	CaCO₃	盐酸
B	MgCl₂	NaCl	硝酸银溶液
C	C	Fe	稀硫酸
D	CO₂	HCl	氢氧化钠溶液

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若关于x的一元二次方程kx²﹣2x﹣1=0有两个不相等的实数根，则k的取值范围是____．

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—I am very t____. I can't walk any more.

—Let me help you.

同类题4

选择方框内的单词，并用其适当的形式填入空白处，使内容意思通顺，语法正确。

have too favorite Japan year

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下列氮原子结构的表述中，对电子运动状态描述正确且能表明同一电子层电子能量有

差异的是C 原子结构

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