以下适用于伤风感冒引起的头痛、头晕,以及晕车不适等症状的是()
A.紫花烧伤膏
B.京万红
C.化痔栓
D.风油精
参考答案:D
Bill's math is much than any other student's in his class.[ ]
A. good
B. better
C. best
D. the best
功:______,有用功:______,额外功:______,总功:______,机械效率:______.