用基准物NaCl配制0.1000mg/mL Cl-的标准溶液1000mL,需称取Na

题型:单项选择题

问题:

用基准物NaCl配制0.1000mg/mL Cl-的标准溶液1000mL,需称取NaCl固体( )。

A.100mg

B.1g

C.0.1648g

D.0.5085g

考点:水质检验工初级水质检验工初级
题型:单项选择题

     Peter was a small boy.He lived with his parents in a small house near some hills.The people there

were all poor.

    One night it was very dry and windy.

    When everybody was asleep,Peter suddenly heard some noise.It came out from the kitchen(厨房).

He got up and walked to the kitchen.He found that the wood beside the stove(火炉)was burning.

There was no water tap(水龙头)in the house,so he could not put out(扑灭)the fire.He shouted loudly

to wake up everyone in the house.They all left their houses quickly.

    At last the fire was put out by the firemen.Many houses were burnt.But nobody was hurt in the fire.

1.Peter lived with his ________.

A.sisters

B.brothers

C.uncles

D.parents

2.One night he found that ________ beside the stove was burning.

A.the table

B.the wood

C.the door

D.the window

3.________,so he could not put out the fire.

A.Everybody was asleep

B.He couldn't shout loudly

C.The kitchen was very big  

D.There was no water tap in the house

4.Peter knocked on the doors of many houses ________.

A.to wake the people up

B .to get some water

C.to find his classmates

D.to visit them

5.________ hurt in the fire.

A.People in other houses were

B.Peter's parents were  

C.Nobody was

D.Peter was

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月球和其他卫星一样本身不会发光,我们看到它是由于其()。

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对于直流电动机用其()来反映,通过电压继电器来控制电动机速度。

A.定子频率

B.感应电动势

C.速度继电器

D.电磁继电器

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女性,32岁。因胃纳亢进,体重增加1年半就诊。体检:身高160cm,体重75kg,腹部、臀部脂肪肥厚,下腹部及大腿上部可见淡红色皮纹。血压150/95mmHg

进一步检查发现患者24小时尿游离皮质醇增高,血浆皮质醇:8am414nmol/L(15μg/d1);4pm331.2nmol/L(12μg/d1);0am281.5nmol/L(10.2μg/d1),为了明确诊断还应做()

A.ACTH兴奋试验

B.CRF兴奋试验

C.大剂量地塞米松抑制试验

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