第四市场是指由机构投资者和筹资者直接进行证券买卖所形成的市场。

The noise from the top floor, loud and constant, of the meeting-room _____ can be clearly heard in our

classroom. [ ]

A. being decorated

B. having been decorated

C. to be decorated

D. decorated

一个正方形周长是64米，它的边长是多少米？

Once upon a time there was a mountain, on the top of which _____ in which lived three monks.[ ]

A. did a temple stand

B. stood a temple

C. a temple stood

D. a temple did stand

患者，24岁，诊断明确为强直性脊柱炎，伴腰骶部晨僵。下列哪项体格检查能准确反映患者腰椎前屈运动受限程度

A．枕墙距测量
B．指地试验
C．“4”字试验
D．Schober试验
E．髂嵴推压试验

杆OA绕固定轴O转动，圆盘绕动轴A转动，已知杆长l=20cm，圆盘r=10cm，在图示位置时，杆的角速度及角加速度分别为ω=4rad/s，ε=3rad/s²；圆盘相对于OA的角速度和角加速度分别为ω_r=6rad/s，ε_r=4rad/s²。则圆盘上M₁点绝对加速度为（）。

A．a₁=363cm/s²

B．a₁=463cm/s²

C．a₁=563cm/s²

D．a₁=663cm/s²