25T型客车电池欠压保护动作后，恢复值为（）
A.105±1V
B.100±1V
C.97±1V
D.99±1V
参考答案：C
_______ makes the people in Shanghai proud is _______ they have achieved a lot in the past ten years.
A．What; because
B．What; that;
C．That; what
D．That; because
若级数an发散，bn发散，则有下列中何项结论（）？
A.（an+bn）发散
B.nbn发散
C.（an+bn）收敛、发散不确定
D.（an-bn）收敛
an发散，