在最大设计风速条件下,接触线距受电弓中心的最大水平偏移值,当电力机车受电弓工作宽度为1250mm时,不宜大于()mm。
A.300
B.350
C.400
D.450
参考答案:D
Many audiences listened to his speech very attentively from the very beginning to the end, my parents ___________.
A.included
B.containing
C.including
D.contained
关于采油树放气阀的描述正确的是()
A、放气阀的英文缩写为GVV
B、放气阀是通过封隔器的唯一通道
C、放气阀可让分离器分离出来的气体通过封隔器
D、以上全是