确诊椎动脉型颈椎病的首要检查是
A．X线平片检查
B．MRI检查
C．椎动脉造影检查
D．CT检查
E．椎动脉血流图
参考答案：C
Gary Locke , a Chinese-American, once______ as the governor of Washington for 8 years and now is U．S．Commerce Secretary．
A．had worked
B．worked
C．is working
D．has been working
生产现场管理要做到“三防护”，即自我防护、设备防护、环境防护。
