-How long may I _____ the book?
-Two weeks.[ ]
A. borrow
B. lend
C. buy
D. keep
答案:D
便携式超声诊断仪的国内供电是()
A.220V,50Hz
B.110V,50H
C.220V,60Hz
D.110V,60Hz
E.360V,50H