It was rainy all day. We had to stay _____ home. [ ]
A. at
B. in
C. from
D. around
答案:A
左心房异常表现为()
A.P波形态多样
B.V1导联P波高耸
C.仅在V1导联有深倒的P波
D.P波存在但被掩盖
E.无P波
发动机个别缸不工作时,可用螺丝刀对某汽缸作断火检查,如发动机转速(),表明该汽缸不工作。
A.不变
B.升高
C.降低
D.变化