最高运行速度不超过160km/h的列车,()设备与列车运行监控记录装置结合使用,或采用列车超速防护系统。
A、地面信号
B、机车信号
C、设备信号
D、通过信号
参考答案:B
Should RGS (regulator of G protein signaling) proteins be classified as GEFs (guanine nucleotide exchange factors) or GAPs (GTPase activating proteins) Explain what role this activity plays in modulating G-protein-mediated responses in animals and yeasts.
任何组织和个人对于违反劳动法律、法规的行为有权()。
A.回避
B.进行阻挠
C.检举和控告
D.提起诉讼