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进行下列标定时 , 欲使滴定剂消耗约 25mL , 需称取各基准物质的量为 : ( 1 ) m (KHC 8 H 4 O 4 )___________ g , 用来标定 0.20 mol / L KOH 溶液 ; ( 2 ) m (K 2 Cr 2 O 7 )___________ g , 用来标定 0.10 mol / L Na 2 S 2 O 3 溶液 ; ( 3 ) m (Na 2 CO 3 )___________ g , 用来标定 0.50 mol / L HCl 溶液 ; ( 4 ) m (Na 2 C 2 O 4 )___________ g , 用来标定 0.050 mol / L KMnO 4 溶液 ; ( 5 ) m (NaCl)___________ g , 用来标定 0.10 mol / L AgNO 3 溶液。 [ M r (KHC 8 H 4 O 4 ) = 204.2 , M r (K 2 Cr 2 O 7 ) =294.18 , M r (Na 2 CO 3 ) = 106.0 , M r (Na 2 C 2 O 4 ) = 134.0 , M r (NaCl) = 58.44 ]
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【单选题】What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology?
A.
lowest port MAC address
B.
port priority number and MAC address.
C.
VTP revision number
D.
highest port priority number.
E.
path cost
【单选题】What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology?
A.
lowest port MAC address
B.
port priority number and MAC address.
C.
highest port priority number.
D.
path cost
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A.
path cost
B.
lowest port MAC address
C.
VTP revision number
D.
highest port priority number
E.
port priority number and MAC address
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