As Edith Hamilton reminded us about Socrates, students
A. should learn knowledge from their teachers with modesty.
B. should investigate what the God has put in their hearts.
C. were encouraged to discover the truth themselves.
D. were required to find the spark to fame.
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若n为自然数，(21n+4,14n+3)=_______________________。
《中华人民共和国食品安全法》规定：从事餐饮服务应当依法取得餐饮服务许可。()
属于井巷工程结算价差调整的主要材料品种为 ()
A. 水泥
B. 金属模板
C. 中空六角钢
D. 水泥制品
E. 锚杆
F. 木模板
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