空调冷凝水系统的渗漏试验可采用（），无渗漏为合格。

A.充水试验

B.水压试验

C.气压试验

D.通水试验

Although it is convenient and enjoyable to own a car, people have to suffer troubles caused by traffic jam______.2. Considering causes of the problem, measures could be taken by the local government in the following aspects______.3. With a sound transportation system______,