MPLS报文头部有（）bits。
A.64
B.32
C.16
D.8
参考答案：B
Owing to a financial disagreement, the cooperation broke down and the two businessmen finally went their ______ ways.
A．common
B．separate
C．selfish
D．lonely
生活饮用水卫生标准中一般化学指标有多少项？其中对水的pH值和总硬度有何要求？
