与钙离子协同时对神经肌肉的兴奋性有抑制作用的是()。
A.钾离子
B.镁离子
C.铜离子
D.无机磷
E.铁离子
参考答案:B
--John, I’ve got my dream job.
--Congratulations! But I want to remind you that you should play better if you really want to
_______ a good impression ______ the employer.
A.leave ; to
B.make; to
C.leave; with
D.make; on
水溶性季铵盐是()
A.药根碱
B.次乌头碱
C.东莨菪碱
D.莨菪碱
E.甲基伪麻黄碱