速度控制回路一般采用改变进入执行元件的()来实现。
A.压力
B.流量
C.功率
D.动力
参考答案:B
--What do you want to do next? We have half an hour until the basketball game.
--____. Whatever you want to do is fine with me.
A.It just depends
B.It’s up to you
C.All right
D.Glad to hear that
胃癌钡剂造影检查()
A.溃疡呈椭圆形龛影,边缘光滑
B.胃黏膜呈"鹅卵石样"改变
C.胃内可见形状规则、边缘整齐的半圆形充盈缺损阴影
D.胃内可见边缘整齐的圆形充盈缺损,中心可出现"脐样"溃疡龛影
E.龛影不规则,有半月征