乳粉生产中真空浓缩的温度应是（）℃，浓缩终点以31.71～32.5°Be最为合适.
参考答案：45-60
——_____was the Nanjing-Changjiang Bridge open to traffic?
——It was open to traffic in 1968.
A．What
B．What time
C．How long
D．When
2型糖尿病患者血糖控制的目标是（）
A.HbAlc<5.0%
B.HbAlc<5.5%
C.HbAlc<6.0%
D.HbAlc<6.5%
E.HbAlc<7.0%
