内环境______保持相对稳定的状态,称为稳态。
参考答案:理化性质
.
He chose to teach in a western province, though he _______in the city for a better life.
A.could stay
B.would stay
C.could have stayed
D.had stayed
高程控制网采用三、四等水准测量,对于大型企业用三等水准作首级水准网,而用四等水准加密,小型企业用四等水准一次布设。( )