一种酶蛋白只与一种辅酶（基）结合，构成专一的酶。
参考答案：对
Lacking rain, many river in Yunnan province have ______ recently.
A．dried up
B．dried out
C．dried off
D．dried at
重吸收Na+能力最强的部位是
A．近球小管
B．髓袢降支
C．髓袢升支
D．近曲小管
E．集合管
