孔板流量计中孔板的作用是（）。
A.附件
B.传感
C.节流
D.引压
参考答案：C
More and more people choose to shop in a supermarket as it offers a great ________ of goods. [ ]
A. variety
B. mixture
C. extension
D. combination
不属于三身佛的是( )。
A．释迦牟尼佛 B．毗卢遮那佛C．卢舍那佛 D．阿弥陀佛
