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【判断题】
气相色谱法测定环境空气和废气中有机氯农药和多氯联苯类化合物时，PUF吸附剂在初次使用前的净化方法之一是在提取器中，依次使用甲苯、丙酮、二乙醚：己烷（1∶10）进行提取，然后进行真空干燥。
A.
正确
B.
错误
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参考答案：
举一反三
【单选题】Exams, grades and marks should be abolished because children's progress should be estimated only by ______.
A.
educated persons
B.
the children themselves
C.
teachers
D.
parents
查看完整题目与答案
【单选题】用单行文字“ TEXT ”命令书写直径符号时应使用 _______ 。 A . B . C . D .
A.
%%d
B.
%%p
C.
%%c
D.
%%u
查看完整题目与答案
【单选题】计算机网络是一个()。
A.
管理信息系统
B.
编译系统
C.
在协议控制下的多机互联系统
D.
网上购物系统
查看完整题目与答案
【单选题】Exams, grades, and marks should be abolished because children's progress should only be assessed by ______.
A.
educated persons
B.
the children themselves
C.
teachers
D.
parents
查看完整题目与答案
【单选题】According to the author, what should today's parents do?
A.
They should do the same thing as yesterday's parents did.
B.
They should educate their children according to traditional values.
C.
They should cooperate with their children's teacher.
D.
They should seek the balance between limitation on their children's behavior. and the freedom they wanted.
查看完整题目与答案
【单选题】AU those youngesters willbecome_________in ten years．
A.
growns-ups
B.
growns-up
C.
grown-up
D.
grown．ups
查看完整题目与答案
【单选题】Youngesters should settle their rivalries through competitive dance instead of fighting.
A.
F
B.
O
查看完整题目与答案
【单选题】用单行文字“ TEXT ”命令书写直径符号时应使用 ( ) 。
A.
%%d
B.
%%p
C.
%%c
D.
%%u
查看完整题目与答案
【多选题】读者进入图书馆的下列做法,哪几项是不得体的?
A.
读者不用遵守馆内各项规章制度，图书馆的规章制度只需图书馆工作人员遵守
B.
读者进入馆内，可以嬉戏打闹，大声喧哗
C.
读者可以穿着拖鞋进入图书馆
D.
读者要自觉爱护图书馆的书刊、电脑等设备，不可涂鸦，刻画和损坏
查看完整题目与答案
【单选题】鸡白痢的检疫通过下列哪种实验进行?
A.
HA
B.
HI
C.
全血平板凝集实验
D.
琼脂扩散实验
查看完整题目与答案
相关题目：
【单选题】Exams, grades and marks should be abolished because children's progress should be estimated only by ______.
A.
educated persons
B.
the children themselves
C.
teachers
D.
parents
查看完整题目与答案
【单选题】用单行文字“ TEXT ”命令书写直径符号时应使用 _______ 。 A . B . C . D .
A.
%%d
B.
%%p
C.
%%c
D.
%%u
查看完整题目与答案
【单选题】计算机网络是一个()。
A.
管理信息系统
B.
编译系统
C.
在协议控制下的多机互联系统
D.
网上购物系统
查看完整题目与答案
【单选题】Exams, grades, and marks should be abolished because children's progress should only be assessed by ______.
A.
educated persons
B.
the children themselves
C.
teachers
D.
parents
查看完整题目与答案
【单选题】According to the author, what should today's parents do?
A.
They should do the same thing as yesterday's parents did.
B.
They should educate their children according to traditional values.
C.
They should cooperate with their children's teacher.
D.
They should seek the balance between limitation on their children's behavior. and the freedom they wanted.
查看完整题目与答案
【单选题】AU those youngesters willbecome_________in ten years．
A.
growns-ups
B.
growns-up
C.
grown-up
D.
grown．ups
查看完整题目与答案
【单选题】Youngesters should settle their rivalries through competitive dance instead of fighting.
A.
F
B.
O
查看完整题目与答案
【单选题】用单行文字“ TEXT ”命令书写直径符号时应使用 ( ) 。
A.
%%d
B.
%%p
C.
%%c
D.
%%u
查看完整题目与答案
【多选题】读者进入图书馆的下列做法,哪几项是不得体的?
A.
读者不用遵守馆内各项规章制度，图书馆的规章制度只需图书馆工作人员遵守
B.
读者进入馆内，可以嬉戏打闹，大声喧哗
C.
读者可以穿着拖鞋进入图书馆
D.
读者要自觉爱护图书馆的书刊、电脑等设备，不可涂鸦，刻画和损坏
查看完整题目与答案
【单选题】鸡白痢的检疫通过下列哪种实验进行?
A.
HA
B.
HI
C.
全血平板凝集实验
D.
琼脂扩散实验
查看完整题目与答案
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