检测合格传感器可以粘贴黄色标识码？
参考答案：检测合格传感器可以粘贴黄色标识。
If you'd written earlier, I'd have known when you _____ to go on holiday.[ ]
A. want
B. have wanted
C. wanted
D. will want
《出口危险货物包装容器质量许可证》的有效期为（）年。
A．1
B．2
C．3
D．5
