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【单选题】
下面有关计算机的特点说法中,不正确的是A.
运算速度快
B.
计算精度高
C.
所有操作是在人的控制下完成的。
D.
有记忆功能
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【简答题】请写出发热的定义
【简答题】若离心泵的实际安装高度大于允许安装高度，在操作中会发生（）现象。
【单选题】How can people eat smart according to the speaker?
A.
Knowing what to eat.
B.
Knowing how to eat.
C.
Choosing nourishing foods.
D.
All of the above.
【单选题】It can be inferred from the passage that in early America ______.
A.
people competed with each other fiercely for land
B.
many people worked for the railroad companies
C.
quite a few families made it on their own
D.
social and personal interdependence was indispensable to Americans
【简答题】填写单词。 1. His books have _______ the lives of millions of people. 2. How can I try to _______ English like a native speaker? You'd better practice more with English speaker. 3. It's our _______ to keep...
【简答题】请分别写出水分、灰分、挥发分、发热量和固定碳的项目符号?
【简答题】若离心泵的实际安装高度（）允许安装高度，在操作中会发生气蚀现象。
【单选题】The Lewis structure of N 2 H 2 shows __________.
A.
a nitrogen-nitrogen triple bond
B.
a nitrogen-nitrogen single bond
C.
each nitrogen has one non-binding electron pair
D.
each nitrogen has two non-binding electron pairs
E.
each hydrogen has one non-bonding electron pair
【单选题】How many total valence electrons should be used when drawing the Lewis structure of ?
A.
17
B.
24
C.
28
D.
44
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