下列属于中枢性抗胆碱药的是()
A.山莨菪碱
B.后马托品
C.阿托品
D.苯海索
E.以上都不是
参考答案:D
___ the danger of drunk driving, many drivers promised never to drive after drinking. [ ]
A. To realize
B. To have realized
C. Realized
D. Having realized
(1)作出图甲的铡刀使用中的两个力臂,并表明L1和L2 。
(2)画出图乙所示斜面上小球所受重力的示意图。
(3)在图丙所示的滑轮组上绕线,使匀速提升重物G时最省力。