【单选题】She () to study hard. (Fill the blank with a proper word.)
A、have
B、has
A、have
B、has
A、Bombay
B、Bomb
C、Bubble
D、Baby
A、Z(t) is a stationary process
B、Sz(f) = Sx(f) + Sy(f)
C、Sz(f) = Sx(f) + Sy(f) + Sxy(f) + Syx(f)
D、If the two processes X(t) and Y(t) are uncorelated and at least one of the processes is zero mean,then Sz(f) = Sx(f) + Sy(f)
A、Hebrew
B、British
C、Greek
D、America
A、did they
B、do they
C、they did
D、they did not
A、It is a beverage of fermented mare's milk.
B、It is mare's milk.
C、It is cow's milk.
A、It has to be imported from southern part of China.
B、It has to be imported from northern part of China.
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