由于TD终端目前还存在不稳定现象，所以换机比例控制在（）的容许率，且不低于公开市场的容许率。
A、30%
B、40%
C、35%
D、45%
参考答案：B
The Acropolis ________ in the 5th century B. C. at a high altitude above the city in honour of
Athena, the goddess of Athens.[ ]
A. constructed
B. was constructed
C. has been constructed
D. is being constructed
颈椎病牵引的开始重量，一般是人体体重的（）。
A.5%～7%
B.8%～9%
C.10%～11%
D.12%～14%
E.15%～20%
