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【单选题】
细胞毒性T细胞的作用是A.
具有ADCC效应
B.
直接杀伤靶细胞
C.
杀伤靶细胞不受MHC限制
D.
无抗原特异性
E.
具有吞噬作用
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反馈参考答案：
举一反三
【多选题】芒硝的性状特征有( )
A.
无色透明或类白色半透明,条痕白色
B.
表面逐渐风化而覆盖一层白色粉末
C.
质脆易碎,断面具玻璃样光泽
D.
断口贝壳状
E.
气微,味淡
【单选题】—How's your teacher today? —_____. [ ]
A.
I'm fine, thank you.
B.
She's fine, thanks.
C.
He's good, thanks.
D.
They are fine, thank you.
【单选题】When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to ().
A.
Add one hour to the times listed under the reference stations
B.
Subtract one hour from the time differences listed for the subordinate stations
C.
Apply no correction as the times in the reference stations are adjusted for daylight savings time
D.
Add 15° to the standard meridian when calculating the time difference
【单选题】Then _____ of that time when he was cowboy .
A.
. Comes the memory
B.
. came the memory C. the memory comes D . the memory came
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