呕吐物不含宿食,消炎解痉可缓解()。
A.瘢痕性幽门梗阻
B.活动性溃疡致幽门痉挛水肿
C.胃癌并幽门梗阻
D.十二指肠降部以下梗阻性病变
E.低位肠梗阻
参考答案:B
It was such a funny show that people couldn't help _____ again and again. [ ]
A. laugh
B. to laugh
C. laughing
推土机宜用于( )以内运距、Ⅰ~Ⅲ类土的挖运。
A.50m
B.100m
C.500m
D.1000m