【单选题】标准斜齿外啮合圆柱齿轮的正确啮合条件是__________。 A: mn1=mn2=m, αn1=αn2=α, β1= -β2 B: m1=m2 α1=α2 han1=han2 C: mn1=mn2=m, αn1=αn2=α, β1= β2 D: m1=-m2 α1=-α2 han1=-han2

Han Fu refers to the clothing in the Han dynasty.

Who fixed the date of the Spring Festival? ( ) A: Emperor Wudi in the Han Dynasty B: Emperor Jingdi in the Han Dynasty C: Emperor Huidi in the Han Dynasty D: Emperor Shaodi in the Han Dynasty

‏Tofu was invented in Western Han Dynasty instead of Eastern Han Dynasty.‏

Why are there eight ancestral temples in Heshun? A: Han people liked temples. B: Han people think the temples are beautiful. C: Han people built their own temples in memory of their ancestors. D: Han people were forced to build temples.

In the Qin dynasty, the “______” for clothing and personal adornments continued till the Western Han dynasty and was changed to red in the Eastern Han dynasty because it was believed that red displayed the Han dynasty’s virtues.

Which one is wrong about Han Xin? A: Han Xin's reputation had not been good at his hometown in hisearly life. B: Han Xin was recommended to Liu Bang by Chen Ping. C: When Han Xin selects his troops,the more the better. D: After Xiang Yu's death, Han Xin was granted the title of "King of Chu" by Liu Bang.

Which one of the following is a classical officials-writing book? A: Shi Ji（Records of the Grand Historian） B: Han Shu（History of the Han Dynasty） C: Zi Zhi Tong Jian D: Han Jin Chun Qiu

In China, if a Tibetan communicates with a Han, it is _____.

The Lantern Festival can be traced back to the earliest( ) A: Western Han dynasty B: Eastern Han dynasty C: Three kingdoms