水柱计用于测量（），是通风机房必备的仪表，由U形玻璃管、刻度尺及底板组成。
A、风压
B、温度
C、湿度
D、电流
参考答案：A
矿灯内置充电控制板，输出电压稳定在（）之间。
A、4.10V±0.05
B、4.20V±0.05
C、4V±0.05
Only ticket-holders were _______ to the stadium for the concert given by Jay Chou, so many of his fans were turned away.
A．allowe
B．permitted
C．agreed
D．admitted
