Some airplanes are() going 1,000 miles an hour.
A.able of
B.possible of
C.probable of
D.capable of
与扫描定位精度有关的是
A. X线束的准直校正
B. 准直器
C. 扫描方式
D. 检查床运动控制系统
E. 定位投光器
The boy’s () development was very advanced for his age.
A.intelligent
B.intellectual
C.internal
D.external
Would you please () your visit for a few days, stay a few days longer?
A.expand
B.lengthen
C.stretch
D.extend