【单选题】有关维生素D的下列叙述哪项是错误的
B.
维生素D3必须经过肝、肾二次羟化作用后,才能转变为活性维生素D3
C.
1,25 (OH) 2 D3具有促进钙磷吸收和促进骨盐更新的作用
【单选题】有关维生素D的下列叙述哪项是错误的()
A.
维生素D 3 是主要发挥生理作用的D 3 形式
B.
维生素D 3 必须经过肝、肾二次羟化作用后,才能转变为活性维生素D 3
C.
1,25(OH) 2 VitD 3 具有促进钙磷吸收和促进骨盐更新的作用
【单选题】Was he ________to get to school on time when he got up at 7:45?
【单选题】关税的纳税人应当自海关填发税款缴款书之日起( )内,向指定银行缴纳税款。
【简答题】A.He is happy to share dessert with the woman. B.He didnt know what time to have lunch. C.He expected the traffic to be bad. D.He is not upset that they have had lunch.
【单选题】有关维生素D的下列叙述哪项是错误的()
B.
维生素D3必须经过肝、肾二次羟化作用后,才能转变为活性维生素D
C.
1,25(OH)2VitD3具有促进钙磷吸收和促进骨盐更新的作用
【单选题】Why is the man not able to find the book he needs?
A.
It's the first time he's come to the library.
B.
There's only one reading room in the library.
C.
He wants to refer to the book for some figures
【单选题】有关维生素D的叙述下列哪项是错误的
B.
维生素D必须经过肝、肾二次羟化作用后,才能转变为活性维生素D
C.
1,25(0H)2D3具有促进钙磷吸收和促进骨盐更新的作用