在PON网络中可使用多模尾纤。
参考答案：错
混凝土或抹灰基层涂刷乳液型涂料时，含水率不得大于（）
A.10%
B.15%
C.20%
D.25%
Many young people believe that war is stupid and unnecessary. To them, to lose one’s life on the battlefield is ______ .
A．glorious B．futile C．heroic D．courageous
