北京希电公司生产的PCM复用设备最多可提供()路以太网接口。
A、4
B、6
C、8
D、10
参考答案:B
She some mistakes in her exercises the day before yesterday.
A. made
B. had made
C. has made
D. was making
钢管在出厂前应进行技术检验,填写证明报告书,检验的方法和内容是()。
A.水压试验;
B.工艺性能试验:压扁、扩口、翻边;
C.几何尺寸检验:直径、壁厚、椭园度、直线度等;
D.化学成份检验和机械性能检验。