舱门滑梯预位完毕后检查点线合一—桔红色圆点与预位箭头相分离。
参考答案：错
Mathematics _____ the language of science. [ ]
a. is
b. has been
c. are
d. have been
促进肾小管分泌H+的主要因素是
A．K+的分泌
B．Na+的分泌
C．NH3的分泌
D．尿素的排泄
