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【单选题】
雉鸡、鹧鸪等鸡形目鸟类的足属于( )A.
攫足
B.
前趾足
C.
掘足
D.
併趾足
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皮皮学刷刷变学霸
举一反三
【单选题】Which of the following statement is correct?
A.
Salivary glands in mammals are endocrine glands.
B.
Parotid duct opens into the oral cavity, at cheek mucosa opposite the upper first molar.
C.
The liver is mainly located in the left upper quadrant of the abdominal cavity.
D.
Pancreas is a gland organ in the digestive and endocrine system.
E.
The major function of bile is to break down proteins.
【单选题】Repeated middle ear infections have destroyed the tympanic plexus in the middle ear cavity. The loss of preganglionic parasympathetic fibers that pass through the plexus diminish production of
A.
Mucus in the nasal cavity
B.
Mucus on the soft palate
C.
Saliva by the parotid gland
D.
Saliva by the submandibular and sublingual glands
E.
Tears by the lacrimal gland
【简答题】工业企业负荷计算常用的方法有哪些?其中逐级计算法是如何进行计算的,请简要说明。
【简答题】下列数据中包含二位有效数字的是( )。 A．2.0×10 -5 B．pH=6.5 C．8.10×10 5 D．-5.3
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