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【单选题】
下列协议标准中,那个传输速率是最快的( )。A.
802.11a
B.
802.11g
C.
802.11n
D.
802
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【单选题】A new study indicates that basic steps taken by people daily can go a long way in ____ the greenhouse gas emission.
A.
cutting down
B.
taking down
C.
pulling down
D.
breaking down
【多选题】The basic pathway for repairing damage to DNA involves three basic steps:
A.
Step 1: excision: the damaged DNA is recognized and removed by one of a variety of mechanisms. These involve nucleases, which cleave the covalent bonds that join the damaged nucleotides to the rest of the DNA strand, leaving a small gap on one strand of the DNA double helix in the region.
B.
Step 2: resynthesis: a repair DNA polymerase binds to the 3ʹ-hydroxyl end of the cut DNA strand. It then fills in the gap by making a complementary copy of the information stored in the undamaged strand.
C.
Step 3: ligation: when the repair DNA polymerase has filled in the gap, a break remains in the sugar–phosphate backbone of the repaired strand. This nick in the helix is sealed by DNA ligase, the same enzyme that joins the Okazaki fragments during replication of the lagging DNA strand.
D.
All the above
【单选题】The basic steps to make an effective presentation
A.
Prepare, introduce, organization, delivery, end, exchange, conclusion and summary
B.
Prepare,Speech, organization, delivery, end, exchange, conclusion and summary
【简答题】零件有上、下、左、右、前、后六个方位,在主视图上只能反映零件的 方位,俯视图上只能反映零件的 方位。
【简答题】春装目录_______________
【简答题】An international contract should be executed through four basic steps: pre-preparation for contract, contract negotiation, 1 and contract execution, and each steps includes detail procedures, an inter...
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