小儿腹泻应用2∶1等张含钠液的适应证是
A.重度或中度脱水有明显周围循环障碍者B.中度脱水无循环衰竭者C.补充继续损失量D.补充生理需要量E.高渗性脱水
参考答案:A
在△ABC中,已知∠C=90°,BC=3,tgB=2,那么AC=______.
They are having a meeting, so they are busy ________.[ ]
A. at present time
B. at the present times
C. at present
D. in the present