汽车在水平地面上转弯，地面对车的摩擦力已达到最大值．当汽车的速率加大到原来的二倍时，若使车在地面转弯时仍不打滑，汽车的转弯半径应（   ）

根据句意，写出括号内所给单词的适当形式。
（1）“We don't want to be treated ____   (different) from others,” the disabled said.
（2）When a strong wind came from the northwest, the heavy haze(雾霾) over Wuxi city began to____(appear).
（3）It's lucky to have so much ____ (value) experience in learning English during the course.
（4）I can't understand his ____ (silent) on such an important matter.

①统一了六国     ②统一了度量衡   ③用楷书书写    ④确立了皇帝称号