实水一身悉肿,腹胀喘满,二便不利,脉沉实有力者,治疗应选用()
A.五苓散
B.五皮散
C.实脾散
D.真武汤
E.十枣汤
参考答案:B
当一个做匀速圆周运动的人造卫星的轨道半径增大到原来的2倍时,则( )
A.卫星的线速度减小到原来的倍
B.卫星所需向心力减小到原来的1/4倍
C.卫星的线速度也增大到原来的2倍
D.卫星所需向心力减小到原来的1/2倍
For all its extremes, Venus is a(n) incalculable laboratory for researchers studying the weather and climate of earth.
A.invaluable
B.valuable
C.value
D.valueless