A:designing
B:design
C:designed
D:to desig
长江经济带能够实现东部沿海与中西部地区良性互动,是因为长江流域具有( )
—Bill, can I use your dictionary? I left mine at home.—Of course you________. Glad to help you.
函数fx=exlnx在点1,f1处的切线方程是( )