【单选题】抗原提呈细胞与 CD8+T 细胞之间的相互作用受
D.
MHC-I 类分子限制和 MHC-II 类分子共同限制
【单选题】下列关于T细胞介导的免疫应答的说法,哪项是错的
D.
Th细胞与APC细胞之间相互作用受MHCII类分子限制
【单选题】Have you ever asked him the reason______may explain his absence from the class?
【多选题】MHC-肽与T细胞受体间的相互作用的属性决定了T细胞的命运:存活、死亡或激活
A.
在胸腺中,T细胞的阳性选择(生存)是TCR和胸腺上皮细胞所展示的MHC-自身肽之间相对较弱的相互作用的结果。
B.
阴性选择(死亡)是由TCR和髓质胸腺上皮细胞或胸腺树突状细胞表达的MHC-自身肽之间的强相互作用诱发的。
C.
离开胸腺后T细胞的活化是TCR与专职抗原提呈细胞展示的MHC-肽之间强相互作用的结果。
【单选题】生产中要培育壮苗,保持的温度条件应当是 ( )
【单选题】You are the network consultant from Cisco.com. Please point out the reason that STP required when VLANs do not span access layer switches.()
A.
ensure a loop-free topology
B.
protect against user-side loops
C.
support business applications
D.
risk of lost connectivity without STP
【简答题】Directions : In this section, you will hear a passage three times. When the passage is read for the first time, you should listen carefully for its general idea. When the passage is read for the secon...
【多选题】Directions: Fill in the blanks by selecting suitable words from the word bank. Each word in the bank is identified by a letter. Please choose the corresponding letter for each item. You may not use an...
J.
extended K. sparked L. positive M. comfort N. dictate O. tropical
【多选题】What need to be put down when you are taking a message through the phone?
A.
The reason of calling.
B.
The time and date of the call.
C.
What needs being done after the call.
D.
Where the call is from.