隔爆设备的隔爆腔之间（）直接贯通，必须保持原设计的防爆性能，否则此设备为失爆。
A、严禁
B、可以
C、完好
D、不失爆
参考答案：A
After serving as a soldier in Iran for five years, he ____ a new job in Seoul as a driver.
A．took up
B．kept up
C．saved up
D．drew up
应买票而未买票的儿童只补收儿童票。身高超过1．5米的儿童使用儿童票乘车时，应补收儿童票价与全价票价的差额，核收手续费。（部竞赛题）
