变速器可以同时挂上两个挡位，说明变速器的（）失效。
参考答案：互锁装置
Whoever has _____ sense knows that smoking is harmful to people's health. [ ]
A. normal
B. general
C. common
D. usual
第一类客船每位乘客所需游步甲板面积（）m2
A、0.2
B、0.3
C、0.4
D、0.1
