成年女性血沉的参考值范围为()。
A.0~5mm/h
B.5~15mm/h
C.0~20mm/h
D.0~15mm/h
E.3~15mm/h
参考答案:C
跳伞运动员在空中匀速下落的过程中:[ ]
A.动能增大
B.重力势能减小
C.机械能不变
D.机械能增加
The two leaders made a show of unity at the press conference, though they had notably messages.A. discontinuous B. discreet C. discordant D. disadvantageous