小额支付系统付款行对发起的（）不可以发送撤销申请。
A．普通贷记支付业务
B．定期贷记支付业务
C．实时贷记支付业务
D．定期借记支付业务回执
参考答案：C
汞、橡胶、金刚石这些物质中，常温下呈液态的是______，适宜用做冲击钻钻头的是______．
Difficulties and hardships have________the best character of the young geologist. [ ]
A. brought in
B. brought up
C. brought out
D. brought about
