机体细胞外液K+浓度的恒定主要依靠()
A.K+进入细胞内
B.K+经由远端肾小管排泌
C.K+经由近端肾小管排泌
D.K+经由消化道排出体外
E.以上都不是
参考答案:A
“现代经济价值观取得了又一次胜利”是指( )。
A.大量建成的核电站取得了很大的经济价值
B.核电事业的发展检验了现代经济价值观的科学性
C.现代经济价值观保障了核电事业的发展
D.现代经济价值观的科学性在核电事业的发展中再次得到证实
Never ______ so excited because it is the first time that I ______ such a fantastic experience.
A.I have been; had
B.have I been; have had
C.have I been; had had
D.I have been; have