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【简答题】
乳稠计是用以测定牛乳 的密度计,若 20 °C 时 刻度为 30 o ,则乳的相对密度是 ;
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举一反三
【简答题】什么是实体?在E-R图中用什么图形表示?什么是属性?在E-R图中用什么图形表示?
【单选题】We know that 80 of the cases of blindness can .
A.
per cents; cure
B.
percent; cured
C.
per cent; be cured
D.
percent; are cured
【简答题】在 E-R 图中,实体使用 图形来表示,联系使用 图形来表示 。
【单选题】—Don't you go to school by bike? —________. I walk to school every day.
A.
Yes, I don't
B.
Yes, I do
C.
No, I don't
【简答题】I get off the bus and walk a few blocks. I stop when I get to a garage-like place and walk to the metal door with brown paint. I turn the knob(把手)and walk in. A thousand eyes look at me as I take my p...
【单选题】—You know that you were driving at 100 kilometers per hour, don’t you? —No, officer, I _____ have been. This car can’t do more than 80.
A.
mustn’t
B.
shouldn’t
C.
may not
D.
couldn’t
【单选题】Only thirty per cent of ______ parents say that they know what their children like to do after _____ school.
A.
/, the
B.
a ,the
C.
the, /
D.
a, a
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