曲线y=xex+2x+1在点（0，1）处的切线方程为 （ ）．
y=3x+1
A basketball match between the two famous teams_______ on the coming Saturday afternoon.
A．will have played
B．will be played
C．is played
D．plays
检查泵体是否有振动，要求泵的振动幅值一般不超过（）mm。
A、0.08
B、0.15
C、0.01
D、0.05
