配制硫酸溶液时,以下操作正确的是()A.水倒入硫酸中并搅拌 B.硫酸倒入水中并搅拌

题型:单项选择题

问题:

配制硫酸溶液时,以下操作正确的是()

A.水倒入硫酸中并搅拌

B.硫酸倒入水中并搅拌

C.水沿玻棒注入硫酸中

D.在量筒中配制

考点:注册会计师食品检验学食品检验学题库
题型:单项选择题

B Customs of Bulgaria: Marriage and Family保加利亚习俗:婚姻与家庭
The average age for women to marry is between 18 and 25.25 tend to (1) when somewhat older. A church wedding often (2) the legal civil ceremony, and a large reception, which often involves (3) music and dancing, is held in the evening. Wedding traditions include (4) money on the bride’s dress to represent future prosperity, the groom (5) the bride at her home, and the couple pulling on opposite (6) of a loaf of bread—whoever gets the largest piece will be (7) boss of the family. Honeymoons are a new tradition.
The principle (8) mutual support is valued in the Bulgarian family. The elderly are (9) cared for by their adult children. Unmarried adults live with their (10) and many newly married couples live with one set of parents (11) they are able to get housing of their own. Most families (12) urban areas live in apartments, which are in short
supply, while (13) in rural areas usually have their own houses. Many village houses (14) owned by families who live in urban areas, who use them_ (15) summer and weekend retreats, or for retired parents.
Most families in (16) areas do not have more than two children, while families in (17) areas tend to be larger. Grandparents play an important role in (18) care, particularly in urban areas, where most women work outside the (19) . Men of the younger generation have begun to help with household (20) , once considered only women’s responsibility.


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庆“国庆”联欢会上,五年级和六年级共买气球171个.已知五年级买气球个数的
1
4
和六年级的
1
5
相等.求五年级和六年级各买气球多少个?
想:五年级买气球个数的
1
4
和六年级的
1
5
相等,那么,五年级买气球个数与六年级的比是多少?
题型:单项选择题

对于断路器弹簧机构下列描述正确的是()

A.断路器弹簧机构合闸弹簧储能完毕后,行程开关应立即将电动机电源切除。

B.断路器断路器合闸完毕,弹簧机构行程开关应将电动机电源接通。

C.断路器弹簧机构合闸弹簧储能后,牵引杆的下端或凸轮应与合闸锁扣可靠地锁住。

D.断路器弹簧机构分、合闸闭锁装置动作应灵活,复位应准确而迅速,并应开合可靠。

E.断路器弹簧机构分闸完毕,弹簧能量已释放,电机回路应立即接通进行储能。

题型:单项选择题

藻酸盐印膜材料与胶结剂的反应极为迅速,需加入缓凝剂延缓反应进行。常用的缓凝剂不包括

A.磷酸钠

B.碳酸钠

C.氧化锌

D.草酸盐

E.磷酸三钠

题型:单项选择题

康德最著名的学论著是()。

A.《美学》

B.《判断力批判》

C.《汉堡剧评》

D.《拉奥在孔》

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