糖尿病可分为
A．青年型和老年型B．显性和隐性C．磺酰脲类和双胍类D．Ⅰ型和Ⅱ型E．长效和短效
参考答案：D
—How long ______ here?
—Only ten minutes. Tim ______ here with me. [ ]
A. are you; has walked
B. are you; walked
C. have you been; walked
D. have you been; has walked
我们用的温控仪通讯波特率是（）。
A、1000
B、4500
C、9600
D、12000
