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【判断题】
细菌一般为有性繁殖,以二分法繁殖,几十分1~2小时分裂一次。A.
正确
B.
错误
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举一反三
【单选题】Suppose【图片】 is a real function. Which of the following statements is NOT true?
A.
If is differentiable on , then is continuous on .
B.
If is continuous on , then exists.
C.
If exists for some , then is continuous at .
D.
If , , then is constant on .
【单选题】设函数 f(x)= 4x+2 x 2 -1 - 3 x-1 (x＞1) a-1(x≤1) 在点x=1处连续，则a=（ ）
A.
、 1 2
B.
） 2 3
C.
） 4 3
D.
） 3 2
【单选题】Suppose that real interest rates in the United States rise relative to real interest rates in Switzerland, there would occur a (an):
A.
Increase in the demand for francs--decrease in the supply of francs-depreciation of the dollar
B.
Increase in the demand for francs--decrease in the supply of francs-appreciation of the dollar
C.
Decrease in the demand for francs--increase in the supply of francs-appreciation of the dollar
D.
Decrease in the demand for francs--decrease in the supply of francs-depreciation of the dollar
【简答题】{在网络中,物理层传输的数据单位称为比特,数据链路层传输的数据单位通常称为____,网络层传输的数据单位通常称为____。}
【简答题】Suppose the equation x 2 -2kx+k2-1=0 has two unequal real roots x 1 ,x 2 , which satisfy |xi-1|< 3(i=1,2). Then the range of values for the real number k is _____.
【单选题】Suppose real GDP exceeds potential real GDP. If the government decreases its expenditures on goods and services, then real GDP ( ) and the price level ( ).
A.
decreases; rises
B.
increases; falls
C.
decreases; falls
D.
increases; rises
【简答题】设函数 f(x)= 1+x -1 x ，(x≠0) a ，(x=0) 在x=0处连续，则实数a的值为 ．
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