迷走神经兴奋时()
A.延长窦房结与周围组织不应期
B.缩短窦房结与周围组织不应期
C.减慢房室结的传导
D.抑制窦房结自律性与传导性
E.加快房室结的传导
参考答案:A, C, D
They will pay a visit to Europe in a couple of years _____ they have enough money.
A.for fear that
B.on condition that
C.even though
D.as well as
与水俣病有关的物质是()。
A.镉
B.苯酚
C.铅
D.甲基汞
E.多氯联苯