神经细胞膜在静息时通透性最大的离子是( )
A.Na+
B.K+
C.Ca2+
D.Cl-
E.HCO3-
参考答案:B
财产保险的保险利益的时效规定是( )。
A.保险合同订立时
B.损失发生时
C.从保险合同订立到损失发生时
D.从保险合同订立到合同到期时
To compete more effectively with others,it is time that university students to study
abroad after graduation.
A.tried
B.are trying
C.try
D.will try