钙排泄的主要器官()
A.肾脏
B.肠道
C.汗液
D.唾液
E.胆道
参考答案:B
解析:
钙通过肠管及肾排泄,经肾排泄的钙占体内总排钙量的20%。
我国现行税法规定,一般纳税人从小规模纳税人处购进的货物,一律不得计算进项税额抵扣销项税额。 ( )
It was not until she got home Jennifer realized she had lost her keys. [ ]
A. when
B. that
C. where
D. before