单项选择题

In the WAN, when a point-to-point subnet is used, an important design issue is the router interconnection

A．technology
B．computer
C．service
D．lines
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单项选择题
Assume that N=2M and FIFO is used. If the string p1,p2,...,pN is repeated three times, then the number of page faults is
A．
N/2

B．
N 2N

C．
2N
单项选择题
设有关系R(A,B,C)，在下列的等式中，不成立的是
A．σA＜2(πA，B()=π A,B(σA＜2(
B．πA,C(σA＜2( =σA＜2(πA,C()
C．πB,C(σA＜2( =σA＜2(πB,C()
D．πA(ЛA,B()=π A(
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