阿托品()
A.M受体阻断药
B.N1受体阻断药
C.N2受体阻断药
D.α受体阻断药
E.β受体阻断药
参考答案:A
She bought________eggs yesterday, but there were________them broken. [ ]
A. two scores of; scores of
B. scores of; two scores of
C. scores of; two score of
D. score of; two scores
重为100N长1m的质量分布不均匀铁棒平放在水平面上,某人将它一端缓慢竖起,需做功55J,若将它另一端缓慢竖起,需做功( )
A.45J
B.55J
C.60J
D.65J