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【单选题】
使用分液漏斗进行分液时,下列操作中正确的做法是( )
A.
分离液体时,分液漏斗上的小与大气相通就打开旋塞
B.
分离液体时,将漏斗拿在手中进行分离
C.
上层液体经漏斗的上口放出
D.
没有将两层间存在的絮状物放出
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参考答案:
举一反三
【简答题】Salem, the “City of Peace”, is a small city with a big history. It is the second established city in Massachusetts and the second oldest settlement in New England. While Salem has been long known as t...
【单选题】In Salem Village case, those women were actually______.
A.
ill
B.
witches
C.
good-looking
D.
gentle
【简答题】CAS-OB精炼法是指在CAS精炼法的基础上增加了()功能。
【单选题】正弦波振荡电路如图所示,若该电路能持续稳定的振荡,则同相输入的运算放大器的电压放大倍数应等于( )。【图片】
A.
2
B.
3
C.
1
D.
1/3
【单选题】正弦波振荡电路如图所示,若该电路能持续稳定的振荡,则同相输入的运算放大器的电压放大倍数Au应等于().
A.
1
B.
2
C.
3
D.
1/3
【单选题】A suitable title for the passage would be ______.
A.
The Significance of Salem's Witch Trials.
B.
European Settlers and American Indians.
C.
The Reflection on the Details of .Salem's Witch Trials.
D.
Campaigning on the Indian Frontier.
【简答题】Passage Young Goodman Brown came forth at sunset into the street at Salem village; but put his head back after crossing threshold, to exchange a parting kiss with his wife. And Faith, as the wife was ...
【单选题】在窗体上有一个文本框,其名称为Text1,编写下列事件过程: Private Sub Text1_KeyPress(KeyAscii As Integer) Dim str As String str=Chr(KeyAscii) KeyAscii=Asc(UCase(str)) Text1.Text=Stririg(2,KeyAscii) End Sub 程序运行后,如果在键盘上输入字母“a”,则...
A.
aaa
B.
AAA
C.
AA
D.
aa
【单选题】题,2 1、下列消毒剂中属于气体杀菌剂的是:
A.
甲醛
B.
环氧乙烷
C.
过氧乙酸
D.
乙醇
E.
戊二醛
【单选题】只能杀灭细菌繁殖体和亲脂病毒的化学消毒剂和通风换气、冲洗等机械除菌法属于()
A.
无菌
B.
高水平消毒法
C.
中水平消毒法
D.
低水平消毒法
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