下列引起的呕吐为反射性的是()。
A.幽门梗阻
B.脑炎
C.脑膜炎
D.妊娠
E.尿毒症
参考答案:A
There are over 100 night clubs in the city, but you don’t often see that is empty.
A.one
B.the one
C.it
D.that
弯曲加工最终是使弯曲部分产生()变形。