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【单选题】
液氨是无机合成中常用的溶剂,系列说法错误的是( )。 A. 质子溶剂 B . 两性溶剂 C . 分子溶剂 D . 亲水溶剂
A.
B.
C.
D.
D
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【单选题】_____ more than 100 million references to the word“tuhao” on social media since early September.
A.
It has been
B.
There is
C.
There have been
D.
They are
【判断题】双绞线是由两根铜芯线相互缠绕而成的,其缠绕方式是随机的,并无特别方式。
A.
正确
B.
错误
【单选题】More than one hundred students ___ been sent to Japan since 2000.
A.
have
B.
has
C.
are
D.
is
【单选题】1 体系的下列各组物理量中都是状态函数的是: ( )
A.
T , p , V , Q
B.
m , V m , C p , ∆ V
C.
T , p , V , n
D.
T , p , U , W
【简答题】Since weeks ago, China has been involved in a worldwide A/H1N1 flu that has already killed more than 80 people in the middle of May, 2009, in Mexico and has turned into a global pandemic. The central ...
【简答题】已知点P的坐标为(m,n),O为坐标原点,连结OP,将线段OP绕O点顺时针旋转90°得OP′,则点P′的坐标为________.
【简答题】FPA provides a more limited cover than WPA,since it does not include( )losses and damages.
【简答题】已知点P的坐标是(3,3),O为原点,将线段OP绕着原点O旋转45°得到线段OQ,则点Q的坐标是 _________ .
【简答题】(12分)设直线 与圆 交于A、B两点,O为坐标原点,已知A点的坐标为 .(Ⅰ)当原点O到直线 的距离为 时,求直线 方程;(Ⅱ)当 时,求直线 的方程。
【判断题】老师可以在视频中插入一个测验并随机放置在视频中任何一个位置
A.
正确
B.
错误
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