在神经纤维动作电位的去极相,通透性最大的离子是().
A.Na+
B.K+
C.Cl-
D.Ca2+
E.Mg2+
参考答案:D
In my view,_______seems to be no possibility that we shall be able to afford that big a house .
A.that
B.there
C.it
D.this
试述柴油机“飞车”时的应急处理?