高含硫油气井是指地层天然气中硫化氢含量高于()的井。
A.10ppm
B.100ppm
C.20ppm
D.30ppm
参考答案:A
TT系统多用于供电可靠性要求很高的电气装置中。()
An internet is a combination of networks connected by (1). When a datagram goes from a source to a (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet? The decision is based on optimization: Which of the available (5) is the optimum pathway?
空白(3)处应选择()
A.destinations
B.routers
C.packets
D.computers