对热缩管加热要(),以圆周形式从根部渐渐向上收缩。火焰移动的速度要控制好。
A、快
B、均匀
C、慢
D、集中
参考答案:B
— Are there ___________ eggs on the table?
— No, there are ___________ pears on it.[ ]
A. any, some
B. some, some
C. any, any
D. some, any
简述早期妊娠行超声检查的意义。