设f(x)在(0，+∞)上有定义，且f’(1)=a(≠0)，又对任意x，y∈(0，+∞)，有f(xy)=f(x)+f(y)，则f(x)=（）．
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车辆掉头前，应首先观察车后交通情况，掉头过程中前进或倒车时部应当观察前后方交通情况。
A. 对
B. 错
设函数y=y(x)由方程2xy=x+y所确定，则dy|x=0=______．
设f(x)=(ex-1)(e2x-2)…(enx-n)，其中n为正整数，则f’(0)=______．
When and where will the negotiation be held
At 3:00 p.m. in Room 313 of the Commercial Building downtown tomorrow.
B. At 3:30 p.m. in Room 303 of the Commercial Building downtown tomorrow.
C. At 3:13 p.m. in Room 330 of the Commercial Building downtown tomorrow.
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