稀释浓硫酸时,应在烧杯等耐热的容器中进行,在玻璃棒的不断搅拌下缓慢地将() A.硫酸

题型:单项选择题

问题:

稀释浓硫酸时,应在烧杯等耐热的容器中进行,在玻璃棒的不断搅拌下缓慢地将()

A.硫酸加到水中;

B.水加到硫酸中

C.同时放到容器中;

D.都可以。

考点:粮油质量检验员考试中级粮油质量检验员中级粮油质量检验员题库
题型:单项选择题

We call the Chinese New Year the Spring Festival. There is a name for each Chinese year. We may call it the year of the sheep, the year of the monkey or the year of the pig. And this year is the year of dragon. Before New Year’s Day, people are busy shopping and cleaning their houses. On New Year’s Eve, there is a big family dinner. After dinner all the families stay up late to welcome the New Year. On the first day of the New Year, people put on the new clothes and go to visit their friends. They say “Good luck” and some other greetings (问候) to each other. People usually have a very good time during the festival.

小题1:How many Chinese festivals are talked about in this passage?

A.One

B.Two

C.Three

D.Four小题2:We can find that every Chinese year is given ______ name.

A.an animal

B.a plant

C.a family

D.a full小题3:The underlined phrase “stay up” in the passage means “______”.

A.建造

B.张贴

C.熬夜

D.起立小题4:On New Year’s day, people say “______” to each other when they meet.

A.Merry Christmas

B.Good luck

C.Happy New Year

D.Both B and C小题5:The best title (标题) for this passage is ______.

A.Good time

B.The Spring Festival

C.Big dinner

D.The Year of the Dragon

题型:单项选择题

对下列物理公式的理解,说法正确的是(  )

A.由公式a=

△v
t
可知,加速度a由速度的变化量△v和时间t决定

B.由公式a=

F
m
可知,加速度a由物体所受合外力F和物体的质量m决定

C.由公式E=

F
q
可知,电场强度E由电荷受到的电场力F和电荷的电量q决定

D.由公式R=

U
I可知,电阻R由电阻两端的电压U和通过电阻的电流I决定

题型:单项选择题

用试验模拟沿地表作水平运动物体的地转偏向现象:东仔同学打开伞,抬头面视伞面内侧,顺时针转伞;珠女同学向转动的伞面顶部滴红墨水,并观察红墨水流动过程,据此回答问题。

红墨水在伞面上流动的轨迹为:

A.先偏右后偏左

B.向右偏转

C.先偏左后偏右

D.向左偏转

题型:单项选择题

下列哪步不是HLA分型中SBT分型法所必需的()

A.待测细胞的DNA分离

B.应用座位、组或等位基因特异性引物进行的PCR扩增

C.扩增产物的纯化和测序

D.扩增产物在无变性的聚丙烯凝胶电泳

E.测出的基因序列与基因库的DNA已知序列比较

题型:单项选择题

青霉素过敏属()。

A.Ⅰ型超敏反应

B.Ⅱ型超敏反应

C.Ⅲ型超敏反应

D.Ⅳ型超敏反应

E.Ⅰ型和Ⅱ型超敏反应合并型

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