The input method description is missing the K key in following input 
methods.

   M-x set-input-method
* chinese-cns-quick
* chinese-cns-tsangchi
* chinese-b5-quick
* chinese-b5-tsangchi

The K key is expected in the key sequence H J K L for QWERTY keyboard 
as shown in the *Help* buffer after invoking

   M-x describe-input-method

This is what it looks like, the K key is missing:
     [A 日] [S 尸] [D 木] [F 火] [G 土] [H 竹] [J 十] [L 中]

This is what a K key looks like inserted in the above key row:
     [A 日] [S 尸] [D 木] [F 火] [G 土] [H 竹] [J 十] [K 大] [L 中]

-- 
vl