线切割3B格式编程中加工直线时有四重加工指令()、()、()、()。
参考答案:L1;L2;L3;L4
包括纯化水、注射用水与灭菌注射用水的是()
A.纯化水
B.重蒸馏水
C.注射用水
D.制药用水
A local-area network (LAN) is a communications network that (125) a variety of devices and provides a (126) for information exchange among those devices. The scope of the LAN is small typically a single building or a cluster (丛) of buildings. The LAN is usually owned by the same organization that owns the (127) devices. The internal data rate of LAN is at least several Mb/s. The basic of LAN communication is broadcasting. At each station, there is a transmitter/receiver that communicates over a (128) shared, By other stations. A transmission from any one station is (129) to and received by all other stations.
A.adopted
B.attached
C.selected
D.unified