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【单选题】
关于 LiBr-H 2 O 溶液物性的描述,错误的是A.
溴化锂水溶液对一般金属有腐蚀性
B.
溴化锂的沸点比水低
C.
溴化锂水溶液的浓度过温度过低均易形成结晶
D.
LiBr 在吸收式制冷机中是吸收剂， H 2 O 是制冷剂
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【简答题】求下列函数的定义域： （1）f（x）= ； （2）f（x）= 。
【简答题】（1）求下列函数的定义域： f(x)= 5-x x-1 ； （2）已知函数 f(x)= m x 2 +mx+1 的定义域是一切实数，则m的取值范围．
【单选题】—_______ next year? —She is going to learn more about English. [ ]
A.
When is she going to learn more about English
B.
What does she do
C.
What's she going to do
D.
Where is she going to do
【单选题】More and more people enjoy _____ English. [ ]
A.
learn
B.
to learn
C.
learns
D.
learning
【单选题】Which of the following statements is TRUE?
A.
The more we read and learn, the more ignorant we are.
B.
The more we read and learn, the more learned we are.
C.
The more we read and learn, the more confused we will be.
D.
The more we read and learn, the more snobbish we become.
【单选题】More and more people will have fun _____ English. [ ]
A.
learn
B.
learns
C.
to learn
D.
learning
【简答题】求下列函数的定义域： （1）f（x）= ； （2）f（x）= +4。
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