心胸按压应使胸骨下陷()
A.至少5cm
B.3cm
C.2cm
参考答案:A
干燥
我国电力网络目前的平均额定电压主要有:( )。
A.(A) 3.15kV,6.3kV,10.5kV,36.75kV,115.5kV,231kV,346.5kV,525kV
B.(B) 3.15kV,6.3kV,10.5kV,37kV,115kV,230kV,347kV,525kV
C.(C) 3.15kV,6.3kV,10.5kV,37kV,115kV,230kV,345kV,525kV
D.(D) 3.15kV,6.3kV,10.5kV,36.75kV,115.5kV,230kV,345kV,525kV