保护接零的有效性在于()。A、接地电阻的大小B、接地电阻是否符合要求C、熔断器的粗细

题型:单项选择题

问题:

保护接零的有效性在于()。

A、接地电阻的大小

B、接地电阻是否符合要求

C、熔断器的粗细

D、线路的短路保护装置能否在断路故障发生后灵敏动作

考点:电工特种作业操作证电工复审电工复审题库
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Be Thankful

Be thankful when you don’t already have everything you want.

If you did, what would there be to look forward to?

Be thankful when you don’t know something,

for it gives you the chance to learn.

Be thankful for the difficult times

During those times you grow.

Be thankful for each new challenge(挑战) ,

because it will build your strength(意志) and character(品格).

Be thankful for your mistakes.

They will teach you important lessons

Be thankful when you’re tired,

because it means you’ve made a difference.

It’s easy to be thankful for the good things

A life of rich fulfillment(满足) comes to those

who are also thankful for the setbacks(挫折).

Gratitude(感激) can turn a negative into a positive.

Find a way to be thankful for your troubles,

and they can become your blessings.

小题1:According to the poem, ________ make us grow.

A.difficult times

B.good things

C.challenges

D.blessings小题2:We should thank for new challenges because they will _________.

A.give you the chance to learn

B.build your strength and character

C.teach you important lessons

D.make your life different小题3:_________ can turn a negative into a positive.

A.Troubles

B.Gratitude

C.Mistakes

D.Chances小题4:The underlined word “blessings” probably means “_________” in Chinese.

A.幸事

B.烦恼

C.困境

D.霉运小题5:The writer thinks that we should learn to be _________.

A.thankful

B.helpful

C.important

D.negative

题型:单项选择题

既能温中止血,又可治疗胃寒呕吐、脾虚久泻的药物是()

A.艾叶

B.仙鹤草

C.丁香

D.灶心土

E.生姜

题型:单项选择题

矿用隔爆型磁力起动器的隔离换向开关与前门之间有可靠的()闭锁装置。

A.电气

B.机械

C.液压

题型:单项选择题

缺壁细菌

题型:单项选择题

美国著名心理学家马斯洛在“需求层次论”中,将人类生活需求分成五个层次,下述()不属于该五个层次中的内容。

A.生理需求、安全需求

B.生理需求、心理需求

C.社交需求、自我实现需求

D.尊重需求、自我实现需求

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