【单选题】下列属于B2B电子商务模式的平台是( )。
【判断题】电源中性点经消弧线圈接地的电力系统,在发生单相接地故障后,非故障相对地电压将升高到电源的相电压的3倍。
【判断题】The Dispute Settlement Body of the WTO has two subsidiaries: the Dispute Settlement Panel and the Appellate Body.
【判断题】中性点经消弧线圈接地的电力系统,在发生单相接地故障时,两完好相的对地电压上升为线电压大小。
【单选题】设某环节的传递函数为【图片】,当ω=0.5 rad/s时,其频率特性的相角θ(0.5)=
【单选题】The WTO Dispute Settlement Body automatically adopts the report of a dispute settlement panel within 60 days after it has been circulated unless:
A.
one of the parties appeals the decision.
B.
the Dispute Settlement Body decides by consensus not to adopt the report.
C.
the Dispute Settlement Body is not in session.
【简答题】轴、锯条、弹簧各应选用何种钢材?各应进行哪种热处理?试述其理由:轴(中碳钢,调质、表面淬火等,要求综合机械性能好,耐磨)、锯条(工具钢,淬火加低温回火,要求高硬度高耐磨性)、弹簧(c0.5-0.9,淬火加中温回火,要求高弹性)各应选用何种钢材?各应进行哪种热处理?试述其理由: