启炉过程中主汽温度变化率应控制在什么范围内？
参考答案：
主汽温度变化率0.5～1.5℃/min
In relation to the Company Law of China:
(b) state the requirements for capital of:(i) a general limited liability company; (2 marks)(ii) a sole-person limited liability company; and (2 marks)(iii) a company with exclusive state-ownership. (2 marks)
颌下腺及导管易发生结石的原因中，哪项是错误的
A．导管口大，位于口底，易损伤
B．颌下腺涎液浓而粘稠，流速慢
C．颌下腺导管弯曲而长
D．颌下腺液较腮腺液更偏碱性
E．颌下腺液含粘液量较低
