为了解决双向电路的双向同抢，信令点编码大的交换局主控所有（）电路；信令点编码小的交换局主控所有（）电路。
参考答案：偶数；奇数
We know that the Black Sea, one thousand years ago, was a fresh water lake about ________ and unconnected with the Mediterranean.
A．its two thirds present size
B．two-thirds size of the present
C．its two-thirds of the present size
D．two- thirds its present size
下列给药途径注射液的处方不能添加抑菌剂的是：（）
A.肌内注射
B.静脉输注
C.脑池内注射
D.硬膜外注射
E.椎管内注射
