为了减少真菌性口炎的沉留，用都保装置每次吸药后应该（）
A.清洗都保装置
B.及时漱口
C.喝水
D.全部都对
参考答案：B
The survey __________ our school last month shows that about 2 percent of the students are addicted to Internet games.
A．conducted
B．having been conducted
C．conducting
D．to be conducted
传感器元件检测和输出的矿井环境参数大部分为哪些电信号？
