削耗功率最多,作用在切削速度方向上的分力是()
A.轴向抗力
B.切向抗力
C.径向抗力
D.总切削力
参考答案:C
急性病毒性心肌炎最有效的治疗措施是
A.静脉点滴心肌营养液如ATP、极化液、辅酶Q10等
B.用抗病毒药物治疗
C.完全休息,休息至临床症状消失,心脏大小恢复正常
D.大量静脉点滴维生素C
E.应用激素泼尼松
Which method should be used to secure a manila line to bitts().
A.A round turn on the bitt farthest from the strain and then figure eights
B.A round turn on the bitt closest to the strain and then figure eights
C.Figure eights and then a round turn at the top of both bitts
D.Only figure eights are necessary on both bitts