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【单选题】
用EDTA法测定铜合金(u,Zn,P)中Zn和P的含量时,一般将制成的铜合金试液先用KN在碱性条件下遮蔽去除u2+,Zn2+后,用EDTA先滴定P2+,然后在试液中加入甲醛,再用EDTA滴定Zn2+,下列说法错误的是()A.
Pb的测定属于直接测定
B.
Zn的测定属于置换滴定
C.
甲醛是遮蔽剂
D.
KCN是遮蔽剂
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【单选题】Joan: Look, I'm sorry to bother you about this, but this wall between our rooms is not very soundproofing and I'm doing my homework. Steven: ______
A.
OK. I don't mind.
B.
Just a moment. I'll close the door.
C.
All fight. How about change another room?
D.
Sorry, I'll turn the music down.
【单选题】-You've given us a wonderful Chinese dinner, Mrs. Wang. -- ______.
A.
Oh, I'm afraid I didn't cook very well
B.
I' m glad you enjoyed it
C.
Come again when you are free
D.
It's not necessary for you to say so
【简答题】在作业区域范围内,施工负责人办理请销点手续的车站为()。
【单选题】Dialogue Three Doctor：Well， what can we do for you today? Patient：Oh， I‘m an infection in my gum， Doctor. Doctor：In your gum? Patient：Up here. I‘ve some tablets and， er， I don‘t know. Doctor: 8_______...
A.
It’s been painting me all night，
B.
Let’s have a look and see what they’ve done to you.
C.
Do I take these Sofradex is they're prescribed here， Doctor?
D.
What’s wrong with me， Doctor?
【单选题】子午卫星系统简称_______,是美国海军利用多普勒频移测量技术,研制并建立的具有导航与定位功能的卫星系统。20世纪60年代为北极星潜艇建立的卫星导航系统。
A.
GPS
B.
GNSS
C.
NNSS
D.
GLONASS
【单选题】路中心双黄实线是何含义? A、可跨越对向车道分界线 B、禁止跨越对向车行道分界线 C、双侧可跨越同向车道分界线 D、单向行驶车道分界线
A.
选择1
B.
选择2
C.
选择3
D.
选择4
【简答题】施工负责人办理请销点手续的车站为 ( ) 。
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