胸骨（）
A.由胸骨柄和胸骨体构
B.是扁骨
C.参与构成胸廓
D.前面微凹
E.胸骨角对第一肋切迹
参考答案：B, C
，I have never seen anyone who's as capable as John.
A．As long as I have traveled
B．Now that I have travelled so much
C．Much as I have traveled
D．As I have traveled to much
细水雾灭火系统水压试验用水的水质与管道的冲洗水一致，水中氯离子含量不超过（）mg/kg。
A.10
B.15
C.20
D.25
