给病人输液时,常用橡皮带扎紧病人的前臂,发现手上的“青筋”隆起.这些“青筋”是( )
A:动脉
B:静脉
C:毛细血管
D:动脉与静脉
当我自已的合法权益受到非法侵害,我们最权威、最有效、最正规和最终的维权途径是( )
— There is little water left in the bottle, ______? — No, we need to buy some more before we run out of it.
已知a=20.3,b=log20.3,c=0.32,则( )