实验室应具有检测和(或)校准物品的标识系统。物品在实验室的整个期间应保留该标识。( )
参考答案：对
The book has been translated into thirty laguages since it ____ on the market in 1973.
A．has come
B．comes
C．had come
D．came
汽车护理性美容
