阶梯轴的各个阶梯都有它一定的()和目的,使轴的结构和各个部位,都具有合理的()和()。
参考答案:作用;形状;尺寸
There are many passengers hit by cars and killed ________ because of the drivers' overdrinking,
so drivers' drinking is strictly limited now.[ ]
A. on the spot
B. in the spot
C. under the spot
D. on a spot
糖尿病酮症酸中毒时,补碱纠正酸碱平衡紊乱,下面哪项原则是正确的()
A.一旦pH值下降就应该补碱
B.有循环衰竭而pH值降至7.2以下时应补碱
C.轻、中度酸中毒不须补碱,只有当pH值降至7.1以下时才补碱
D.经补碱pH值升至7.2时应停止补碱
E.补碱常用1.25%的碳酸氢钠