利用加热可以破坏蛋白质与核酸中的
A．糖苷键
B．氢键
C．磷酸键
D．氮
E．氧
参考答案：B
The Arctic is considered _____ the northern part of the Atlantic.
A．having been
B．to have been
C．to be
D．being
（）系统的稳态误差和稳态偏差相同
