A colorless sweet-tasting gas N₂O is used as a mild anesthetic in dentistry and surgery.

[主观题]C．omputers are __________(wide) used in our daily life.

[试题](ii) equipment used in the manufacture of Bachas Blue; and (4 marks)

[单选题]F．irewall is a _______ mechanism used by organizations to protect their LANs from the Internet．A．reliableB．stableC．peacefulD．SecurityA．B．C．D．

[单选题]The______is used to measure the volume of a liquid or gas through a pipeline within any given period of timeA．flow-meterB．viscometerC．micrometerD．feeler

[单选题]The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.A．large conical springsB．compressed air pressureC．hydraulic pressureD．exhaust gas pressure

the plastic-|||-vhich had been used for bottles since-|||-he 1960s,suitable for

[单选题]Bridge gauge can be used to measure （） of a diesel engine.A . diameters of journalsB . deflections of crankwebsC . diameters of crankpinsD . none of the above

[单选题]N-S diagram can used to substitute conventional program flow Chart．In the following phrases，Which does not belong to the basic control structures that contain?A．sequence structureB．condition StructureC．selection structureD．execution structure

[填空题] 将数量级O（1），O（N），O（N2），O（N3），O（NLOG2N），O（LOG2N），O（2N）按增长率由小到大排序。

N2O5分解反应的机理如下:-|||-① _(2)(O)_(5)xlongequal [高温]({K)_(i)}=(N{O)_(2)}+N(O)_(3)-|||