驱动液压泵的电机功率应比液压泵的输出功率大,是因为()。
A. 泄漏损失
B. 摩擦损失
C. 溢流损失
D. 前两种
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Chinese rules of etiquette regarding costumes and adornments started taking shape in the______ dynasty, regulating from nobles down to commoners.
A. Xia
B. Shang
C. Zhou
D. Han
_____ had been used in the front of costumes for several thousand years before the Ming dynasty.
A. buttons
Band knots
C. belts
D. scarf
The four most famous types of embroidery in China are Sichuan embroidery, Suzhou embroidery, Hunan embroidery and _______ embroidery.
A. Shanghai
B. Guangdong
C. Beijing
D. Hangzhou
When a girl is born into a Miao family, her parents will save on food and expenses so as to purchase a complete set of _______ for her.
A. silver jewelry
B. gold jewelry
C. bronze jewelry
D. brass jewelry