折叠式消防救援担架的承重为（）kg。
A.50.0
B.80.0
C.100.0
D.120.0
参考答案：C
He wondered ________ his son was getting along with the experiment.
A．when
B．what
C．how
D．which
有效期自（指定乘车日起）至有效期最后一日的（）止.
