如上题图所示的四杆机构中,杆长尺寸同上题,其运动副为整转副的是( )。
A.A,B
B.C,D
C.A,D
D.全部
参考答案:A
Such poets as Shakespeare _____ widely read, of whose works, however, some _____ difficult to understand.
[ ]
A. are; are
B. is; is
C. are; is
D. is; are
黄体功能不全的病理特点是()
A.子宫内膜活检分泌反应落后2日以上,腺体与间质发育不同步
B.月经第5~6日增生期内膜和分泌期内膜共存
C.月经后半周期仍为增生期改变
D.腺上皮细胞高柱状,腺体数目增多,无异型性
E.腺上皮细胞大小不一,极性消失,可见核分裂象