【简答题】自然铜的主成分是 A.含水硫酸钙(CaSO??4??·??????2H??2??O)?????? B.硫化砷(As2S3) C.三氧化二砷(As2O??3??)?? D.二硫化铁(Fes??2??)?? E.硫化汞(Hgs) 石膏的主成分是 A.含水硫酸钙(CaSO??4??·??????2H??2??O) B.硫化砷(As2S2) C.三氧化二砷(As2O??3?) D.二硫化铁(Fes??2?...
【单选题】关于青霉素G下列哪些说法是错误的
D.
房水和脑脊液中含量低,但炎症时药物可达有效浓度
【判断题】到达卸货的步骤为车辆到达-卸货作业-验收交接-单据处理及反馈。()
【单选题】Which description is correct about P pump ?
A.
Present in the tonoplast ( 液泡膜 )
B.
Present in mitochondria and chloroplast membranes
C.
ATP binding site of P pump is located outside the plasma membrane
D.
P pump can phosphorylate and dephosphorylate itself during the pumping cycle
【简答题】Which of the following is NOT the description of boys' character by mothers? [A] Playful. [B] Loving. [C] Argumentative. [D] Funny.