同一冷却水系统的多台冷却塔安装时，各台冷却塔的水面高度应一致，高差不应大于（）mm。
A、10
B、20
C、30
D、40
参考答案：C
- What will you do when you are lost in a strange city?
- I won't _______ that. Look! I have downloaded the map on my iphone.
A．lead to
B．worry about
C．insist on
D．be interested in
安装在环网柜里的带熔断器的高压负荷开关，一般装有当熔断器一相熔体熔断时负荷开关自动掉闸的击发机构。（）
