铲运机最适宜于开挖含水量不超过37%的松土和普通土，坚土(三类土)和砂砾坚土(四类土)需用松土机预松后才能开挖。
参考答案：错
患儿，男，7岁。睡中遗尿，白天小便频而量少，劳累后遗尿加重，面白气短，食欲不振，大便易溏，舌淡苔白，脉细无力。治疗除取主穴外，还应选用的是（）
A.神门、阴陵泉、胃
B.气海、肺俞、足三里
C.次髎、水道、三阴交
D.百会、神门、内关
E.关元俞、肾俞、关元
“Not having returned home yet, _________”, his father said to the police.
A．his mother got worried
B．his mother must be worried
C．I think he is missing
D．he must have got into some trouble.
