Whatisthebestinstrumentforestablishingasafeworkingareabeforeweldinginaconfinedspace?（）
Anoxygenindicator
B. Acombustiblegasindicator
C. Acombinationcombustiblegasandoxygenindicator
D. Aflamesafetylamp
查看答案
Atransformerinanelectriccircuitservesto（）
A. generateitsownelectricalpower
B. transformelectricalenergyintomechanicalenergy
C. increaseordecreasecircuitvoltageasrequired
D. convertACcurrenttoDCcurrent
WhatisthemostimportantdifferencebetweenthebowtypeanchorshackleandtheD-typeanchorshackle?（）
A. Thebowtypeshackleprovidesasuperiorconnection
B. TheD-typeshackleisweakerthanthebowtype
C. ThebowtypeshackleisweakerthantheD-type
D. TheD-typeshackleprovidesaninferiorconnection
PriortostartinganACgeneratorprimemover,thevoltageregulatorcutoutswitchshouldbeplacedinthe（）
A. manualposition
B. busneutralposition
C. raisevoltageposition
D. transferposition
2014年初，某地发生了由丙型肝炎病毒引起的“丙肝’感染事件。据调查，感染丙肝的居民都曾到未采用一次性注射器的镇卫生所打过针。由此推断（）
A. 带毒针头是丙肝的传染源
B. 丙肝和肺结核的病原体具有相同的结构组成
C. 丙肝属于血液传染病
D. 丙肝与甲型肝炎的传播途径相同
微信支付 
支付宝支付