单选题硫化氢的中毒临界值（TLV）为（）。A10ppmB20ppmC60ppmD50ppm
单选题
硫化氢的中毒临界值（TLV）为（）。
A
10ppm
B
20ppm
C
60ppm
D
50ppm
参考解析
解析：
暂无解析
相关考题：
阈限值(TLV):几乎所有工作人员长期暴露都不会产生不利影响的某种有毒物质在空气中的最大浓度。硫化氢的阈限值为()。 A、15mg/m³(10ppm)B、30mg/m³(20ppm)C、150mg/m³(100ppm)
Which three TLV types are valid in an IS－IS Hello PDU?() A. TLV 10 AuthenticationB. TLV 1 Area AddressesC. TLV 211 Graceful RestartD. TLV 137 Dynamic Hostname ResolutionE. TLV 14 ABRs
Which three IS-IS TLVs are used to support MPLS traffic engineering？ （）A、extended TLV 22B、extended TLV 23C、extended TLV 134D、extended TLV 135E、extended TLV 136F、extended TLV 138
Which two statements about IS reachability TLV (TLV 2) and the extended IS reachability (TLV 22) are true?（）A、TLV 22 supports wide metrics.B、TLV 2 is only used in Level 1 routers.C、TLV 22 displays the neighbor's extended areas.D、Only TLV 22 can support the inclusion of sub-TLVs.
Which two statements about IS reachability TLV （TLV 2） and the extended IS reachability （TLV 22） are true？（）A、TLV 22 supports wide metrics.B、TLV 2 is only used in Level 1 routers.C、TLV 22 displays the neighbor’s extended areas.D、Only TLV 22 can support the inclusion of sub-TLVs.E、 Only TLV 22 can be flooded across L1/L2 boundaries.
Which three TLV types are valid in an IS-IS Hello PDU?（）A、TLV 10 AuthenticationB、TLV 1 Area AddressesC、TLV 211 Graceful RestartD、TLV 137 Dynamic Hostname ResolutionE、TLV 14 ABRs
What ISIS TLVs are used to support MPLS-traffic Engineering？（）A、Extended IS neighbor TLV # 22B、Extended IS name TLV #137C、Extended IS resource TLV #138D、Extended IS reachability TLV #135E、Router ID TLV # 134
多选题Which three IS-IS TLVs are used to support MPLS traffic engineering？ （）Aextended TLV 22Bextended TLV 23Cextended TLV 134Dextended TLV 135Eextended TLV 136Fextended TLV 138
多选题What ISIS TLVs are used to support MPLS-traffic Engineering？（）AExtended IS neighbor TLV # 22BExtended IS name TLV #137CExtended IS resource TLV #138DExtended IS reachability TLV #135ERouter ID TLV # 134
单选题汽油的TLV值为500，甲笨的TLV值为200，则二者的毒害性（）。A前者小B后者小C二者一样大D无法确定