制动踏板自由行程过小不影响叉车的使用。( )
A. 对
B. 错
踩下制动踏板后,踏板必须保持一定的高度,且高度要保持不变。( )
A. 对
B. 错
Mr. Smith is one of the foreign experts ______ are working in China.
A. whose
B. in which
C. who
D. which
I’ll tell you _______ he told me last week.
A. all which
B. what all
C. that all
D. all