下列各项检查对诊断该病都较有价值,需除外()
A.外周血涂片检查
B.镰变试验
C.血红蛋白电泳
D.异丙醇沉淀试验
E.PCR基因诊断
参考答案:D
如图所示,一个做匀变速直线运动的质点,从A点运动到B点和从B点运动刭C点所用的时间均为4s,位移SAB=24m,SBC=64m,求:
(1)质点经过A点时的速度大小.
(2)质点运动的加速度大小.
It has been five years since this party____. Many people wonder whether it will stay on.
A.has come to power
B.came to power
C.has been in power
D.in power