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【判断题】
采集湖泊和水库的水样时,水质控制的采样点在靠近用水的取水口及主要水源的入口。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】Suppose that a worker in Boatland can produce either 5 units of wheat or 25 units of fish per year, and a worker in Farmland can produce either 25 units of wheat or 5 units of fish per year. There are...
A.
25 units
B.
75 units
C.
150 units
D.
250 units
【多选题】若有说明语句 int a[10],*p=a; ，对数组元素的正确引用是( )。
A.
*(p+2)
B.
p[2]
C.
a[2]
D.
a[p]
E.
p[a]
F.
p+2
【单选题】Suppose that a worker in Freedonia can produce either 6 units of corn or 2 units of wheat per year, and a worker in Sylvania can produce either 2 units of corn or 6 units of wheat per year. Each natio...
A.
30 units of corn and 30 units of wheat.
B.
40 units of corn and 30 units of wheat.
C.
40 units of corn and 20 units of wheat.
D.
10 units of corn and 40 units of wheat.
【单选题】If a firm can produce a combination of 60 units of X together with 80 units of Y if it produces 70 units of X, the firm can only produce 60 units of Y, thus the opportunity cost to produce 10 more un...
A.
20 units of Y
B.
10 units of X
C.
two units of Y
D.
one - half a unit of X
【单选题】It is known that solar power can ______ electric energy.
A.
convert into
B.
convert to
C.
be converted into
D.
be converted to
【单选题】Suppose that a worker in Freedonia can produce either 6 units of corn or 2 units of wheat per year, and a worker in Sylvania can produce either 2 units of corn or 6 units of wheat per year. Each natio...
A.
30 units of corn and 30 units of wheat.
B.
no corn and 30 units of wheat.
C.
60 units of corn and 30 units of wheat.
D.
no corn and 60 units of wheat.
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