洗胺塔正常操作时洗涤水适宜温度在（）℃左右。
A.20
B.40
C.60
D.70
参考答案：B
In an office, 40 percent of the workers have at least 5 years of service, and a total of 16 workers have at least 10 years of service. If 90 percent of the workers have fewer than 10 years of service, how many of the workers have at least 5 but fewer than 1 0 years of service ？（）
A．48
B．64
C．80
D．144
E．160
海关对特定减免税的机动车辆的监管期限为8年。( )
