人工急救胸外挤压法已经以每分钟约()次的频率有节奏均匀的挤压,挤压与放松的时间相当。
A.100
B.80
C.60
参考答案:A
The teacher told the boy _____ late again.[ ]
A. to be not
B. not to be
C. to not be
罐车垫木与罐体间隙不大于()
A.4mm
B.5mm
C.6mm
D.7mm