氢键
参考答案：
由于极性共价键的作用，使得电荷作用发生轻微分离而形成的分子相互作用。
The number of people who access to their own cars risen sharply in recent years.
A．has; has
B．has; have
C．have; have
D．have; has
重大和复杂的模板系统必须要事先经过设计。
