从中午12时到下午4时30分,中间经过5时30分。[ ]
错误
There is no doubt_______ English is the widely used language all over the world.
A.that
B.whether
C.if
D.how
P波时间/PR段时间比值为().
A.0.1到1.6
B.1.0到1.6
C.1.0到2.0
D.1.0到1.7
E.0.11到0.16