急性脱水时,体重减轻的主要原因是()
A.组织蛋白分解活跃
B.体液丢失增加
C.体内脂肪消耗增加
D.肌糖原酵解活跃
E.肝糖原氧化增加
参考答案:B
功率为100W的灯泡和40W的灯泡串联后接入电路,40W的灯泡消耗的功率是100W的灯泡的()。
A.4倍
B.0.4倍
C.2.5倍
D.0.25倍
When the foreign guest arrived, I found him speaking good Chinese. I _______ his speech into
Chinese the night before. [ ]
A. needn't translate
B. didn't need to translate
C. needn't have translated
D. didn't need translating