下面的命令表示( ) syms a x y f=sin(a*x)+y^2*cos(x); dfdx=diff(f);
A.
对a求一阶导数
B.
对y求一阶导数
C.
对x求一阶导数
D.
对x求导数
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举一反三
【单选题】The passage suggests that if the grievances of porters in one part of the United States had been different from those of porters in another part of the country, which of the following would have been ...
A.
It would have been more difficult for the Pullman Company to have had a single labor policy.
B.
It would have been more difficult for the Brotherhood to control its channels of communication.
C.
It would have been more difficult for the Brotherhood to uild its membership.
D.
It would have been easier for the Pullman Company’s union to attract membership.
E.
It would have been easier for the Brotherhood to threaten strikes.