【简答题】碳素工具钢T8A中,8代表平均含碳量的__________。
【单选题】The surface of submandibular lymph nodes of goat covered by .
【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
【判断题】确定工业企业计算负荷常用的方法有逐级计算法、需要系数法以及估算法
【简答题】碳素工具钢的含碳量对力学性能有何影响?如何选用?