The computer centre, ____ last year , is very popular among the students in this school.

A．open

B．opening

C．having opened

D．opened

主要的病理生理改变是

A．肾上腺皮质功能亢进

B．心排血量下降

C．胸腔内负压下降

D．急性肾功能衰竭

E．反常呼吸及血容量不足