对动静脉瘘既可以明确诊断，又可以了解瘘口的部位、大小的检查手段
A．B超B．CTC．动脉造影D．指压痿口测定E．静脉血氧含量测定
参考答案：C
______ once every two years, whether it is a car, a bus or a lorry, is the rule that all drivers must obey in our country.
A．Having been examined
B．Examined
C．Examining
D．Being examined
采用（）等抽采方法矿井宜采用高负压抽采系统。
A、本煤层预抽
B、边采边抽
C、边掘边抽
D、先抽后采
